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Linear Modeling (linear + modeling)
Kinds of Linear Modeling Selected AbstractsRACE, ETHNICITY, THREAT AND THE LABELING OF CONVICTED FELONS,CRIMINOLOGY, Issue 3 2005STEPHANIE BONTRAGER Florida law allows judges to withhold adjudication of guilt for persons who have either pled guilty or been found guilty of a felony. This provision may apply only to persons who will be sentenced to probation, and it allows such individuals to retain all civil rights and to truthfully assert they had not been convicted of a felony. This paper examines the effects of race and Hispanic ethnicity on the withholding of adjudication for 91,477 males sentenced to probation in Florida between 1999 and 2002. Hierarchical Generalized Linear Modeling is used to assess the direct effects of defendant attributes as well as the cross-level interactions between race, ethnicity and community level indicators of threat, such as percentage black and Hispanic and concentrated disadvantage. Our results show that Hispanics and blacks are significantly less likely to have adjudication withheld when other individual and community level factors are controlled. This effect is especially pronounced for blacks and for drug offenders. Cross-level interactions show that concentrated disadvantage has a substantial effect on the adjudication withheld outcome for both black and Hispanic defendants. The implications of these results for the conceptualization of racial/ethnic threat at the individual, situational and social levels are discussed. [source] INITIAL LEVELS OF DIFFERENTIATION AND REDUCTION IN PSYCHOLOGICAL SYMPTOMS FOR CLIENTS IN MARRIAGE AND FAMILY THERAPYJOURNAL OF MARITAL AND FAMILY THERAPY, Issue 1 2005Suzanne Bartle-Haring Using Bowen Family Systems Theory as a theoretical underpinning, in this study, we investigated the hypothesis that clients with higher levels of differentiation would improve more quickly in therapy than clients with lower levels of differentiation. Hierarchical Linear Modeling was used to analyze the data over nine sessions of therapy in a sample from an on-campus training clinic. The results suggest that there was variation in the initial levels of psychological symptoms and that differentiation was a significant predictor of this variance. The results also suggest that although psychological symptoms decreased over the nine sessions of therapy, there was very little variance in this change. These results are discussed in relation to Bowen Theory. The difficulties of doing this type of research and the lessons learned from this project are also discussed. [source] Leader-member exchange, differentiation, and task interdependence: implications for individual and group performanceJOURNAL OF ORGANIZATIONAL BEHAVIOR, Issue 6 2006Robert C. Liden We investigated the effects of leader-member exchange (LMX) differentiation on individual and group performance with a sample of 120 work groups consisting of 834 employees who represented six different organizations. LMX differentiation was defined as the degree of variability in the quality of LMX relationships formed within work groups. Hierarchical Linear Modeling (HLM) results did not indicate support for a main effect of LMX differentiation on individual performance. Rather, the results demonstrated that LMX moderated the relation between LMX differentiation and individual performance, such that increases in LMX differentiation were accompanied by increases in individual performance for low LMX members, but no change in individual performance for high LMX members. At the group level, there was not a main effect for LMX differentiation on group performance. However, the hierarchical regression results revealed that the relation between LMX differentiation and group performance was moderated by task interdependence, such that for groups high in task interdependence, the greater the differentiation among group members, the higher the performance of the group. Conversely, for groups with relatively lower levels of task interdependence, differentiation among subordinates was not related to group performance. Finally, LMX differentiation was positively related to group performance in groups with a low LMX median, but was not related to performance in groups with a high LMX median. Copyright © 2006 John Wiley & Sons, Ltd. [source] How and when does complex reasoning occur?JOURNAL OF RESEARCH IN SCIENCE TEACHING, Issue 6 2009Empirically driven development of a learning progression focused on complex reasoning about biodiversity Abstract In order to compete in a global economy, students are going to need resources and curricula focusing on critical thinking and reasoning in science. Despite awareness for the need for complex reasoning, American students perform poorly relative to peers on international standardized tests measuring complex thinking in science. Research focusing on learning progressions is one effort to provide more coherent science curricular sequences and assessments that can be focused on complex thinking about focal science topics. This article describes an empirically driven, five-step process to develop a 3-year learning progression focusing on complex thinking about biodiversity. Our efforts resulted in empirical results and work products including: (1) a revised definition of learning progressions, (2) empirically driven, 3-year progressions for complex thinking about biodiversity, (3) an application of statistical approaches for the analysis of learning progression products, (4) Hierarchical Linear Modeling results demonstrating significant student achievement on complex thinking about biodiversity, and (5) Growth Model results demonstrating strengths and weaknesses of the first version of our curricular units. The empirical studies present information to inform both curriculum and assessment development. For curriculum development, the role of learning progressions as templates for the development of organized sequences of curricular units focused on complex science is discussed. For assessment development, learning progression-guided assessments provide a greater range and amount of information that can more reliably discriminate between students of differing abilities than a contrasting standardized assessment measure that was also focused on biodiversity content. © 2009 Wiley Periodicals, Inc. J Res Sci Teach 46: 610,631, 2009 [source] Adolescents' Emotional Experiences of Mother,Adolescent Conflict Predict Internalizing and Externalizing SymptomsJOURNAL OF RESEARCH ON ADOLESCENCE, Issue 4 2008Meredith L. Gunlicks-Stoessel Research on adolescent emotion has generally focused on expressions of emotion; however, there are reasons to believe that adolescents' experiences of emotion may be related to adolescent development in unique and important ways. This study examined the relation of adolescents' emotional experiences of conflict with their mothers to their internalizing and externalizing symptoms at three time points, each a year apart. After participating in videotaped conflict negotiation tasks with their mothers, adolescents (N=80) watched the videotape of their interactions and used a joystick to make continuous ratings of how negative, positive, or neutral they felt during the discussions. Hierarchical Linear Modeling was used to assess relations among their continuous emotion ratings and their internalizing and externalizing symptoms 1 year before the interaction task, at the time of the interaction task, and 1 year later. Adolescents' externalizing symptoms at the time of the conflict task were associated with negative emotion that decreased across the conflict discussion. Relations between emotional experience and internalizing symptoms a year later were moderated by adolescent gender, revealing that a tolerance for increasing negative emotion predicts fewer future internalizing symptoms for girls. The importance of adolescents' ability to tolerate negative emotion during normal developmental conflicts is discussed. [source] Hierarchical Linear Modeling in Salary Equity StudiesNEW DIRECTIONS FOR INSTITUTIONAL RESEARCH, Issue 117 2003Jane W. Loeb A hierarchical linear model is compared with an ordinary least squares model for conducting salary-equity studies. [source] Peer Sexual Harassment Victimization at School: The Roles of Student Characteristics, Cultural Affiliation, and School FactorsAMERICAN JOURNAL OF ORTHOPSYCHIATRY, Issue 3 2009Shalhevet Attar-Schwartz PhD This study examines the links between students' reports of sexual harassment victimization by peers and a number of individual and school contextual factors. It is based on a nationally representative sample of 16,604 students in Grades 7 through 11 in 327 schools across Israel who completed questionnaires during class. Hierarchical Linear Modeling was used to examine the links. Overall, approximately one in four students (25.6%) were victims of at least one unwanted and unwelcome act of harassment by peers (such as being touched or pinched in sexual manner) in the prior month. The most vulnerable groups were Israeli-Arab boys and students with negative perceptions of their school climate. The school correlates associated with higher levels of victimization were a higher share of students with less-educated parents, larger schools and classrooms, and negative school climate. The interactions between gender and school-related factors indicate that the gender patterns are different for Israeli-Arab and Jewish schools and for schools with different concentrations of students' families with low socioeconomic status. The study emphasizes the need for an ecological perspective in addressing school-based sexual harassment. [source] Waiting for supershrink: an empirical analysis of therapist effectsCLINICAL PSYCHOLOGY AND PSYCHOTHERAPY (AN INTERNATIONAL JOURNAL OF THEORY & PRACTICE), Issue 6 2003John Okiishi Improving the effects of psychotherapy has been accomplished through a variety of methods. One infrequently used method involves profiling patient outcomes within therapist in order to find the empirically supported psychotherapist. This study examined data collected on 1841 clients seen by 91 therapists over a 2.5-year period in a University Counseling Center. Clients were given the Outcome Questionnaire-45 (OQ-45) on a weekly basis. After analysing data to see if general therapist traits (i.e. theoretical orientation, type of training) accounted for differences in clients' rate of improvement, data were then analysed again using Hierarchical Linear Modeling (HLM), to compare individual therapists to see if there were significant differences in the overall outcome and speed of client improvement. There was a significant amount of variation among therapists' clients' rates of improvement. The therapists whose clients showed the fastest rate of improvement had an average rate of change 10 times greater than the mean for the sample. The therapists whose clients showed the slowest rate of improvement actually showed an average increase in symptoms among their clients. Use of this information for improving quality of patient outcomes is discussed.,Copyright © 2003 John Wiley & Sons, Ltd. [source] EXAMINING THE CONDITIONAL NATURE OF THE ILLICIT DRUG MARKET-HOMICIDE RELATIONSHIP: A PARTIAL TEST OF THE THEORY OF CONTINGENT CAUSATIONCRIMINOLOGY, Issue 1 2002GRAHAM C. OUSEY Recently, Zimring and Hawkins (1997) have suggested that drug markets are a "contingent cause" of the increase in homicide rates. That is, where structural conditions known to produce violence are already in place, the drug distribution-homicide link may be exacerbated. This analysis uses hierarchical linear modeling to investigate two key research questions: (1) Is within-city variation in illicit drug market activity positively associated with within-city variation in homicide rates during the 1984,1997 period? (2) Is the illicit drug market-homicide association contingent on preexisting violence conducive socioeconomic conditions? Using three measures of drug market activity, analyses provide affirmative evidence on both questions. Theoretical and research implications of these findings are discussed. [source] Preventing depression: a randomized trial of interpersonal psychotherapy-adolescent skills training,DEPRESSION AND ANXIETY, Issue 5 2010Jami F. Young Ph.D. Abstract Background: The study evaluated the efficacy of an indicated prevention program for adolescent depression. Methods: Fifty-seven adolescents with elevated depression symptoms were randomized to receive Interpersonal Psychotherapy-Adolescent Skills Training (IPT-AST) or school counseling (SC). Hierarchical linear modeling examined differences in rates of change in depression symptoms and overall functioning and analysis of covariance examined mean differences between groups. Rates of depression diagnoses in the 18-month follow-up period were compared. Results: Adolescents in IPT-AST reported significantly greater rates of change in depression symptoms and overall functioning than SC adolescents from baseline to post-intervention. At post-intervention, IPT-AST adolescents reported significantly fewer depression symptoms and better overall functioning. During the follow-up phase, rates of change slowed for the IPT-AST adolescents, whereas the SC adolescents continued to show improvements. By 12-month follow-up, there were no significant mean differences in depression symptoms or overall functioning between the two groups. IPT-AST adolescents reported significantly fewer depression diagnoses in the first 6 months following the intervention but by 12-month follow-up the difference in rates of diagnoses was no longer significant. Conclusions: IPT-AST leads to an immediate reduction in depression symptoms and improvement in overall functioning. However, the benefits of IPT-AST are not consistent beyond the 6-month follow-up, suggesting that the preventive effects of the program in its current format are limited. Future studies are needed to examine whether booster sessions lengthen the long-term effects of IPT-AST. Depression and Anxiety, 2010. © 2010 Wiley-Liss, Inc. [source] A pilot examination of social context and everyday physical activity among adults receiving Community Mental Health ServicesACTA PSYCHIATRICA SCANDINAVICA, Issue 3 2009B. P. McCormick Objective:, Community mental health center (CMHC) clients include a variety of people with moderate to severe mental illnesses who also report a number of physical health problems. Physical activity (PA) has been identified as one intervention to improve health among this population; however, little is known about the role of social context in PA. The purpose of this study was to examine the role of social context in everyday PA among CMHC clients. Method:, Data were collected from CMHC clients in two cultures using accelerometery and experience sampling methods. Data were analyzed using hierarchical linear modeling. Results:, Independence in housing nor culture was significantly associated with levels of PA. Being alone was significantly negatively related to PA level. Conclusion:, Social isolation appears to be negatively related to PA at the level of everyday life. Physical activity interventions with this population should consider including social components as a part of PA. [source] Developmental changes in baseline cortisol activity in early childhood: Relations with napping and effortful controlDEVELOPMENTAL PSYCHOBIOLOGY, Issue 3 2004Sarah E. Watamura Abstract Development of the hypothalamic,pituitary,adrenocortical (HPA) axis was examined using salivary cortisol levels assessed at wake-up, midmorning, midafternoon, and bedtime in 77 children aged 12, 18, 24, 30, and 36 months, in a cross-sectional design. Hierarchical linear modeling (HLM) analyses were used to characterize cortisol production across the day and to examine age-related differences. Using area(s) under the curve (AUC), cortisol levels were higher among the 12-, 18-, and 24-month children than among the 30- and 36-month children. For all five age groups, cortisol levels were highest at wake-up and lowest at bedtime. Significant decreases were noted between wake-up and midmorning, and between midafternoon and bedtime. Unlike adults, midafternoon cortisol levels were not significantly lower than midmorning levels. Over this age period, children napped less and scored increasingly higher on parent reports of effortful control. Among the 30- and 36-month children, shorter naps were associated with more adultlike decreases in cortisol levels from midmorning to midafternoon. Considering all of the age groups together, effortful control correlated negatively with cortisol levels after controlling for age. These results suggest that circadian regulation of the HPA axis continues to mature into the third year in humans, and that its maturation corresponds to aspects of behavioral development. © 2004 Wiley Periodicals, Inc. Dev Psychobiol 45: 125-133, 2004. [source] Proximity to the US,Mexico border: a key to explaining geographic variation in US methamphetamine, cocaine and heroin purityADDICTION, Issue 10 2010James K. Cunningham ABSTRACT Aims Although illicit drug purity is a widely discussed health risk, research explaining its geographic variation within a country is rare. This study examines whether proximity to the US,Mexico border, the United States' primary drug import portal, is associated with geographic variation in US methamphetamine, heroin and cocaine purity. Design Distances (proximity) between the US,Mexico border and locations of methamphetamine, cocaine and heroin seizures/acquisitions (n = 239 070) recorded in STRIDE (System to Retrieve Information from Drug Evidence) were calculated for the period of 1990,2004. The association of drug purity with these distances and other variables, including time and seizure/acquisition size, was examined using hierarchical multivariate linear modeling (HMLM). Setting Coterminous United States. Findings Methamphetamine, cocaine and heroin purity generally decreased with distance from the US,Mexico border. Heroin purity, however, after initially declining with distance, turned upwards,a U-shaped association. During 2000,04, methamphetamine purity also had a U-shaped association with distance. For each of the three drugs, temporal changes in the purity of small acquisitions (<10 g) were typically more dynamic in areas closer to the US,Mexico border. Conclusions Geographic variance in methamphetamine, cocaine and heroin purity throughout the coterminous United States was associated with US,Mexico border proximity. The U-shaped associations between border-distance and purity for heroin and methamphetamine may be due to imports of those drugs via the eastern United States and southeast Canada, respectively. That said, areas closer to the US,Mexico border generally had relatively high illicit drug purity, as well as more dynamic change in the purity of small (,retail level') drug amounts. [source] Mechanisms of behavior change in alcoholics anonymous: does Alcoholics Anonymous lead to better alcohol use outcomes by reducing depression symptoms?ADDICTION, Issue 4 2010John F. Kelly ABSTRACT Rationale Indices of negative affect, such as depression, have been implicated in stress-induced pathways to alcohol relapse. Empirically supported continuing care resources, such as Alcoholics Anonymous (AA), emphasize reducing negative affect to reduce relapse risk, but little research has been conducted to examine putative affective mechanisms of AA's effects. Methods Using lagged, controlled, hierarchical linear modeling and mediational analyses this study investigated whether AA participation mobilized changes in depression symptoms and whether such changes explained subsequent reductions in alcohol use. Alcohol-dependent adults (n = 1706), receiving treatment as part of a clinical trial, were assessed at intake, 3, 6, 9, 12 and 15 months. Results Findings revealed elevated levels of depression compared to the general population, which decreased during treatment and then remained stable over follow-up. Greater AA attendance was associated with better subsequent alcohol use outcomes and decreased depression. Greater depression was associated with heavier and more frequent drinking. Lagged mediation analyses revealed that the effects of AA on alcohol use was mediated partially by reductions in depression symptoms. However, this salutary effect on depression itself appeared to be explained by AA's proximal effect on reducing concurrent drinking. Conclusions AA attendance was associated both concurrently and predictively with improved alcohol outcomes. Although AA attendance was associated additionally with subsequent improvements in depression, it did not predict such improvements over and above concurrent alcohol use. AA appears to lead both to improvements in alcohol use and psychological and emotional wellbeing which, in turn, may reinforce further abstinence and recovery-related change. [source] Ethnic differences in drinking outcomes following a brief alcohol intervention in the trauma care settingADDICTION, Issue 1 2010Craig A. Field ABSTRACT Background Evidence suggests that brief interventions in the trauma care setting reduce drinking, subsequent injury and driving under the influence (DUI) arrest. However, evidence on the effectiveness of these interventions in ethnic minority groups is lacking. The current study evaluates the efficacy of brief intervention among whites, blacks and Hispanics in the United States. Methods We conducted a two-group parallel randomized trial comparing brief motivational intervention (BMI) and treatment as usual with assessment (TAU+) to evaluate treatment differences in drinking patterns by ethnicity. Patients were recruited from a level 1 urban trauma center over a 2-year period. The study included 1493 trauma patients, including 668 whites, 288 blacks and 537 Hispanics. Hierarchical linear modeling was used to evaluate ethnic differences in drinking outcomes including volume per week, maximum amount consumed in 1 day, percentage days abstinent and percentage days heavy drinking at 6- and 12-month follow-up. Analyses controlled for age, gender, employment status, marital status, prior alcohol treatment, type of injury and injury severity. Special emphasis was given to potential ethnic differences by testing the interaction between ethnicity and BMI. Results At 6- and 12-month follow-up, BMI significantly reduced maximum amount consumed in 1 day (P < 0.001; P < 0.001, respectively) and percentage days heavy drinking (P < 0.05; P < 0.05, respectively) among Hispanics. Hispanics in the BMI group also reduced average volume per week at 12-month follow-up (,2 = 6.8, df = 1, P < 0.01). In addition, Hispanics in TAU+ reduced maximum amount consumed at 6- and 12-month follow-up (P < 0.001; P < 0.001) and volume per week at 12-month follow-up (P < 0.001). Whites and blacks in both BMI and TAU+ reduced volume per week and percentage days heavy drinking at 12-month follow-up (P < 0.001; P < 0.01, respectively) and decreased maximum amount at 6- (P < 0.001) and 12-month follow-up (P < 0.001). All three ethnic groups In both BMI and TAU+ reduced volume per week at 6-month follow-up (P < 0.001) and percentage days abstinent at 6- (P < 0.001) and 12-month follow-up (P < 0.001). Conclusions All three ethnic groups evidenced reductions in drinking at 6- and 12-month follow-up independent of treatment assignment. Among Hispanics, BMI reduced alcohol intake significantly as measured by average volume per week, percentage days heavy drinking and maximum amount consumed in 1 day. [source] Guardians and handlers: the role of bar staff in preventing and managing aggressionADDICTION, Issue 6 2005Kathryn Graham ABSTRACT Aims To identify good and bad behaviors by bar staff in aggressive incidents, the extent these behaviors apparently reflect aggressive intent, and the association of aggressive staff behavior with level of aggression by patrons. Design, setting and participants Data on staff behavior in incidents of aggression were collected by 148 trained observers in bars and clubs on Friday and Saturday night between midnight and 2 a.m. in Toronto, Canada. Behaviors of 809 staff involved in 417 incidents at 74 different bars/clubs were analysed using descriptive statistics and three-level hierarchical linear modeling (HLM) analyses. Measurements Observers' ratings of 28 staff behaviors were used to construct two scales that measured escalating/aggressive aspects of staff behavior. Apparent intent level for bar staff was dichotomized into (1) no aggressive intent versus (2) probable or definite aggressive intent. Five levels of patron aggression were defined: no aggression, non-physical, minor physical, moderate physical and severe physical. Findings The most common aggressive behaviors of staff were identified. Staff were most aggressive when patrons were either non-aggressive or highly aggressive and staff were least aggressive when patrons exhibited non-physical aggression or minor physical aggression. Taking apparent intent into consideration decreased staff aggression scores for incidents in which patrons were highly aggressive indicating that some aggression by staff in these instances had non-aggressive intent (e.g. to prevent injury); however, apparent intent had little effect on staff aggression scores in incidents with non-aggressive patrons. Conclusion Although there is potential for staff to act as guardians or handlers, they often themselves became offenders when they responded to barroom problems. The practical implications are different for staff aggression with nonaggressive patrons versus with aggressive patrons. [source] If We Produce Discrepancies, Then How?JOURNAL OF APPLIED SOCIAL PSYCHOLOGY, Issue 9 2010Testing a Computational Process Model of Positive Goal Revision Within the self-regulation literature on goals, both discrepancy reduction and discrepancy production are considered important theoretical and practical processes. Yet, discrepancy production has only been examined in a limited number of goal-striving contexts, and the analytical strategies employed (e.g., difference scores) are difficult to interpret. This study extends discrepancy production research to multiple goal contexts where the goals are in conflict. Computational modeling and an organizational simulation were used to test a control theory explanation of discrepancy production. The occurrence of discrepancy production in the computational model and participants was assessed using hierarchical linear modeling. Comparing the data from the computational model with participants' data indicated a good fit. Implications of the findings and methods are discussed. [source] A Cue Utilization Approach for Investigating Harvest Decisions in Commons DilemmasJOURNAL OF APPLIED SOCIAL PSYCHOLOGY, Issue 3 2009Donald W. Hine Hierarchical linear modeling (HLM) is introduced as a new tool for investigating decision making in commons dilemmas. University undergraduates (N = 171) managed a virtual fishery, with 2 computer-simulated fishers, over 60 seasons. Level 1 HLM analyses revealed that participants took significantly more fish during seasons when feedback suggested fish stocks, fish value, and fishing expenses were high; and when noncooperative and cooperative others had taken more fish and fewer fish, respectively, in the previous season. Level 2 analyses produced several cross-level interactions, indicating that participants' use of feedback information varied as a function of their social values and environmental attitudes. [source] Prediction of dose,response relations based on patient characteristicsJOURNAL OF CLINICAL PSYCHOLOGY, Issue 7 2001Wolfgang Lutz The recent discussion of evidence-based, adaptive treatment planning highlights the need for models for the prediction of courses of treatment response. We combine a dose,response model with growth curve modeling to determine dose,response relations for well-being, symptoms, and functioning. Hierarchical linear modeling was used to model each patient's expected course of improvement. The resulting predictions were cross-validated on two samples of psychotherapy outpatients. The results give further empirical support for the dose,response model and the phase model of psychotherapy as well as for the usefulness of patient treatment response profiling for individual treatment management. © 2001 John Wiley & Sons, Inc. J Clin Psychol 57: 889,900, 2001. [source] The impact of ethnicity on prospective functional outcomes from community-based psychosocial rehabilitation for persons with schizophreniaJOURNAL OF COMMUNITY PSYCHOLOGY, Issue 6 2001Elizabeth S. Phillips Ethnicity was examined for its relationship to prospective functional outcomes from community-based psychosocial rehabilitation for individuals with schizophrenia. Participants were 98 individuals diagnosed with schizophrenia or schizoaffective disorder who were admitted to two community-based psychosocial rehabilitation programs. Previous studies had established that these programs were effective in improving functional outcomes. Data on hospitalization, independent living, social, and work functioning were collected every 6 months for a period of 3 years. The results using hierarchical linear modeling revealed significant differences among non-minorities, African Americans, and Latinos in rehabilitative change over time in the domains of work and social functioning. Non-minorities achieved the greatest gains in both social and work functioning. African Americans showed little change in social functioning, but showed a decline in work functioning. In the domain of work, Latinos deteriorated more than African Americans, and this was most notable for Latino males. There were no cross-ethnic differences in independent living or hospitalization outcomes. Based on these findings, there is important variation among different ethnic groups in their response to psychosocial rehabilitation. Implications are discussed in terms of the need for culturally relevant rehabilitation methods, and for research on cultural constructs in community-based intervention studies. © 2001 John Wiley & Sons, Inc. [source] PREDICTORS OF SUBSTANCE USE AND FAMILY THERAPY OUTCOME AMONG PHYSICALLY AND SEXUALLY ABUSED RUNAWAY ADOLESCENTSJOURNAL OF MARITAL AND FAMILY THERAPY, Issue 3 2006Natasha Slesnick There is a dearth of research that examines the impact of family systems therapy on problems among sexually and/or physically abused youth. Given this void, differential outcome and predictors of substance use change were evaluated for abused, as compared with nonabused, runaway adolescents who were randomly assigned to family therapy or treatment as usual. Abused adolescents reported lower family cohesion at baseline, although both abused and nonabused adolescents showed similar substance use reductions. Utilizing hierarchical linear modeling, we found that substance use changed with change in cohesion over time. These findings link change in family functioning to change in adolescent substance use, supporting family systems theory. Findings suggest that a potent target of intervention involves focus on increasing positive communication interactions. [source] Linking service employees' emotional competence to customer satisfaction: a multilevel approach,JOURNAL OF ORGANIZATIONAL BEHAVIOR, Issue 2 2008Angelo Giardini This study investigates the role of the positive organizational behavior (POB) concept of emotional competence for the effective management of participants' affect in service encounters and customers' assessments about the encounter. We developed and tested a two-level model in which service employees' emotional competence is related to both service employees' and customers' state positive affect. Customers' positive affect, in turn, is related to customers' specific and general evaluations of the service rendered. A total of 394 service encounters involving 53 financial consultants of a bank were assessed. Data were analyzed by a combination of path analysis and hierarchical linear modeling (HLM), and the results support large parts of the model. More specifically, employees' emotional competence was related to customer evaluations through their own positive affective state during the encounter as well as through a direct link to the customer evaluations of the encounter. Copyright © 2008 John Wiley & Sons, Ltd. [source] The Role of Ethnic Matching Between Patient and Provider on the Effectiveness of Brief Alcohol Interventions With HispanicsALCOHOLISM, Issue 2 2010Craig Field Background:, Evaluating the effectiveness of treatments such as brief alcohol interventions among Hispanics is essential to effectively addressing their treatment needs. Clinicians of the same ethnicity as the client may be more likely to understand the culture-specific values, norms, and attitudes and, therefore, the intervention may be more effective. Thus, in cases in which Hispanic patients were provided intervention by a Hispanic clinician improved drinking outcomes were expected. Methods:, Patients were recruited from an urban Level I Trauma following screening for an alcohol-related injury or alcohol problems. Five hundred thirty-seven Hispanics were randomly assigned to brief intervention or treatment as usual. Hierarchical linear modeling was used to determine the effects of ethnic match on drinking outcomes including volume per week, maximum amount, and frequency of 5 or more drinks per occasion. Analyses controlled for level of acculturation and immigration status. Results:, For Hispanics who received brief motivational intervention, an ethnic match between patient and provider resulted in a significant reduction in drinking outcomes at 12-month follow-up. In addition, there was a tendency for ethnic match to be most beneficial to foreign-born Hispanics and less acculturated Hispanics. Conclusion:, As hypothesized, an ethnic match between patient and provider significantly enhanced the effectiveness of brief intervention among Hispanics. Ethnic concordance between patient and provider may have impacted the effectiveness of the intervention through several mechanisms including cultural scripts, ethnic-specific perceptions pertaining to substance abuse, and ethnic-specific preferred channels of communication. [source] Associations of ALDH2 and ADH1B Genotypes With Alcohol-Related Phenotypes in Asian Young AdultsALCOHOLISM, Issue 5 2009Christian S. Hendershot Background:, Associations of ALDH2 and ADH1B genotypes with alcohol use have been evaluated largely using case,control studies, which typically focus on adult samples and dichotomous diagnostic outcomes. Relatively fewer studies have evaluated ALDH2 and ADH1B in relation to continuous drinking outcomes or at different developmental stages. This study examined additive and interactive effects of ALDH2 and ADH1B genotypes on drinking behavior in a mixed-gender sample of Asian young adults, focusing on continuous phenotypes (e.g., heavy episodic and hazardous drinking, alcohol sensitivity, drinking consequences) whose expression is expected to precede the onset of alcohol use disorders. Methods:, The sample included 182 Chinese- and Korean-American young adults ages 18 years and older (mean age = 20 years). Effects of ALDH2, ADH1B and ethnicity were estimated using generalized linear modeling. Results:, The ALDH2*2 allele predicted lower reported rates of alcohol use and drinking consequences as well as greater reported sensitivity to alcohol. There were significant ethnic group differences in drinking outcomes, such that Korean ethnicity predicted higher drinking rates and lower alcohol sensitivity. ADH1B status was not significantly related to drinking outcomes. Conclusions:, Ethnicity and ALDH2 status, but not ADH1B status, consistently explained significant variance in alcohol consumption in this relatively young sample. Results extend previous work by showing an association of ALDH2 genotype with drinking consequences. Findings are discussed in the context of possible developmental and population differences in the influence of ALDH2 and ADH1B variations on alcohol-related phenotypes. [source] A Multilevel Analysis of Gender Differences in Psychological Distress Over TimeJOURNAL OF RESEARCH ON ADOLESCENCE, Issue 2 2009Amanda L. Botticello Females have higher rates of depression than males, a disparity that emerges in adolescence and persists into adulthood. This study uses hierarchical linear modeling to assess the effects of school context on gender differences in depressive symptoms among adolescents based on two waves of data from the National Longitudinal Study of Adolescent Health (N=9,709 teens, 127 schools). Analysis indicates significant school-level variation in both overall symptom levels and the average gender gap in depression net of prior symptoms and individual-level covariates. Aggregate levels of depressive symptomatology were positively associated with contextual-level socioeconomic status (SES) disadvantage. A cross-level contingency emerged for the relationship between gender and depressive symptoms with school SES and aggregate perceived community safety such that the gender "gap" was most apparent in contexts characterized by low SES disadvantage and high levels of perceived safety. These results highlight the importance of context to understanding the development of mental health disparities. [source] A Longitudinal Study of Depressive Symptoms and Marijuana Use in a Sample of Inner-City African AmericansJOURNAL OF RESEARCH ON ADOLESCENCE, Issue 3 2008Paula B. Repetto The association between marijuana use and depressive symptoms was examined longitudinally in a sample of 622 African American youth, interviewed on six occasions, using hierarchical linear modeling (HLM). We considered whether depressive symptoms predicted changes in marijuana use and vice versa from high school through the transition into young adulthood. We also examined gender differences in these behaviors over time. The results indicated that depressive symptoms predicted later marijuana use only for males. Marijuana use did not predict later depressive symptoms for females or males. These findings are consistent with a unidirectional hypothesis indicating that marijuana use may play a role as mood regulator among young males, but not among females. Research findings also indicate that females with lower depressive symptoms use more marijuana than females who report high depressive symptoms. These findings did not change even after controlling for the effects of using other substances at previous stages, school achievement, and demographics factors. These results suggest that depressive symptoms may be an antecedent of marijuana use among African American males. [source] The Relationship Between School Policies and Youth Tobacco Use*JOURNAL OF SCHOOL HEALTH, Issue 1 2009Monica L. Adams MPH ABSTRACT BACKGROUND:, The school setting is frequently used both to educate youth about risks involved in tobacco use and to implement tobacco prevention and cessation programs. Given that school-based programs have resulted in limited success, it is necessary to identify other setting-level intervention strategies. School tobacco policies represent a type of universal intervention that might have some promise for preventing or reducing tobacco use. METHODS:, Hierarchical linear modeling was used to assess whether school tobacco policies were related to observations of tobacco use and current smoking among 16,561 seventh through twelfth graders attending 40 middle and high schools in Illinois. RESULTS:, Results indicated that the enforcement of school tobacco policies, but not the comprehensiveness of those policies, was associated with fewer observations of tobacco use by minors on school grounds as well as lower rates of current smoking among students. CONCLUSIONS:, The school setting is a key system to impact youth tobacco use. Findings underscore the need to train school personnel to enforce school tobacco policy. [source] Subjective Well-Being and PeaceJOURNAL OF SOCIAL ISSUES, Issue 2 2007Ed Diener Hierarchical generalized linear modeling was employed to examine the relations between person-level subjective well-being (SWB) and peace-relevant attitudes, and how these relations vary across nations in the World Values Survey. Person-level SWB was associated with more confidence in the government and armed forces, greater emphasis on postmaterialist values, stronger support for democracy, less intolerance of immigrants and racial groups, and greater willingness to fight for one's country. These associations were moderated at the nation level by liberal development, violent inequality, gross domestic product, and nation-level SWB. The moderator effects indicate that happy people are not completely blind to the conditions of their society and that their endorsement of peace attitudes is sensitive to whether the conditions for peace do exist. [source] Plant functional group responses to fire frequency and tree canopy cover gradients in oak savannas and woodlandsJOURNAL OF VEGETATION SCIENCE, Issue 1 2007David W. Peterson Abstract Questions: How do fire frequency, tree canopy cover, and their interactions influence cover of grasses, forbs and understorey woody plants in oak savannas and woodlands? Location: Minnesota, USA. Methods: We measured plant functional group cover and tree canopy cover on permanent plots within a long-term prescribed fire frequency experiment and used hierarchical linear modeling to assess plant functional group responses to fire frequency and tree canopy cover. Results: Understorey woody plant cover was highest in unburned woodlands and was negatively correlated with fire frequency. C4-grass cover was positively correlated with fire frequency and negatively correlated with tree canopy cover. C3-grass cover was highest at 40% tree canopy cover on unburned sites and at 60% tree canopy cover on frequently burned sites. Total forb cover was maximized at fire frequencies of 4,7 fires per decade, but was not significantly influenced by tree canopy cover. Cover of N-fixing forbs was highest in shaded areas, particularly on frequently burned sites, while combined cover of all other forbs was negatively correlated with tree canopy cover. Conclusions: The relative influences of fire frequency and tree canopy cover on understorey plant functional group cover vary among plant functional groups, but both play a significant role in structuring savanna and woodland understorey vegetation. When restoring degraded savannas, direct manipulation of overstorey tree canopy cover should be considered to rapidly reduce shading from fire-resistant overstorey trees. Prescribed fires can then be used to suppress understorey woody plants and promote establishment of light-demanding grasses and forbs. [source] The relationship between women's subjective and physiological sexual arousalPSYCHOPHYSIOLOGY, Issue 1 2005Alessandra H. Rellini Abstract Previous literature presents discordant results on the relationship between physiological and subjective sexual arousal in women. In this study, the use of hierarchical linear modeling (HLM) revealed a significant concordance between continuous measures of physiological and subjective sexual arousal as assessed during exposure to erotic stimuli in a laboratory setting. We propose that past studies that have found little or no association between the two measures may have been in part limited by the methodology and statistical analyses employed. [source] | ||||||||||||||||||||||