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Coefficient Alpha (coefficient + alpha)
Selected AbstractsMeasuring therapeutic attitudes in the prison environment: development of the Prison Attitude to Drugs scaleADDICTION, Issue 2 2003Nick Airey ABSTRACT Aims, To develop and test the validity of a scale measuring therapeutic attitudes among prison staff working with drug misusers. Design, A cross-sectional postal questionnaire study using 27 statements with a five-point Likert scale. Setting, Four prisons in the south-west of England Participants, A total of 252 prison staff (response rate 70%), including 67 for test,retest (response rate 57%). Findings, The study resulted in a three-dimensional, nine-item scale: the Prison Attitude to Drugs scale (PAD). The three subscales measure confidence in skills (four items), personal rewards (three items) and job satisfaction (two items). Test,retest correlations for the questions were above 0.7, with each factor having an internal coherence (coefficient alpha) of greater than 0.7. Conclusions, The PAD is a reliable tool that can be used in the prison environment. [source] International field test results of the Observable Indicators of Nursing Home Care Quality instrumentINTERNATIONAL NURSING REVIEW, Issue 4 2002FAAN , M. Rantz RN Abstract Researchers at the University of Missouri-Columbia developed the Observable Indicators of Nursing Home Care Quality instrument to measure the dimensions of nursing home care quality during a brief on-site visit to a nursing home. The instrument has been translated for use in Iceland and used in Canada. Results of the validity and reliability studies using the instrument in 12 nursing homes in Reykjavik, in a large Veterans Home in Ontario with 14 units tested separately, and in 20 nursing homes in Missouri, are promising. High-content validity was observed in all countries, together with excellent inter-rater reliability and coefficient alpha. Test,retest reliabilities in Iceland and Missouri were good. Results of the international field test of the Observable Indicators of Nursing Home Care Quality instrument points to the usefulness of such an instrument in measuring nursing home care quality following a quick on-site observation in a nursing facility. The instrument should be used as a facility-wide assessment of quality, rather than for individual units within a facility. We strongly recommend its use by practising nurses in nursing homes to assess quality of care and guide efforts to improve care. We recommend its use by researchers and consumers and further testing of the use of the instrument with regulators. [source] Trust in Nurses Scale: construct validity and internal reliability evaluationJOURNAL OF ADVANCED NURSING, Issue 3 2010Laurel E. Radwin radwin l.e. & cabral h.j. (2010) Trust in Nurses Scale: construct validity and internal reliability evaluation. Journal of Advanced Nursing66(3), 683,689. Abstract Aim., This paper is a report of the continued psychometric evaluation of the Trust in Nurses Scale. Background., Qualitative analyses indicate that trust in nurses is critically important to adult patients. Instruments that distinctively measure this concept are lacking. A middle-range theory of patient-centred nursing care provided the theoretical basis for the Trust in Nurses Scale. Content validity was assessed by an expert panel and patient interviews. Construct validity and reliability were found acceptable using multi-trait/multi-item analysis techniques. These findings were previously reported. Methods., Construct validity and reliability of the Trust in Nurses Scale was assessed in 2007 using data collected during 2004,2005 from 187 hospitalized patients in a haematology-oncology setting. Trust in nurses (the latent factor) was operationalized by five items (manifest variables) using confirmatory factor analyses. Fit statistics included comparative fit index, Tucker-Lewis Index, root mean square error of approximation and the standardized root mean square residual. Internal consistency reliability was assessed using coefficient alpha. Findings., Both a five-item and a four-item version demonstrate acceptable psychometric properties. The five-item version met three fit statistics criteria. Fifty-nine per cent of the variance was explained. A four-item version met all fit statistics criteria. Sixty-six per cent of the variance was explained. Acceptable internal consistency reliability was found for both versions. Conclusion., Previous psychometric testing of the Trust in Nurses Scale provided evidence of the instrument's reliability, content validity and construct validity. The presented analyses further support construct validity. Thus, cumulative findings indicate that the instrument measures with a few items the underlying concept of trust. [source] Attitudes of intensive care nurses towards brain death and organ transplantation: instrument development and testingJOURNAL OF ADVANCED NURSING, Issue 5 2006Jung Ran Kim BN MClinN DipN RN Aims., This paper reports the development and testing of an instrument assessing attitudes of Korean intensive care unit nurses. Background., Reluctance by healthcare professionals to identify brain-dead patients as a potential donor is one reason for a shortfall in transplantable organs in all countries. Organ donation from brain-dead patients is a particularly contentious issue in Korea, following recent legal recognition of brain death within the cultural context of Confucian beliefs. Method., A 38-item instrument was developed from the literature and key informant interviews, and validated by an expert panel and a pilot study. A survey was conducted with Korean intensive care unit nurses (n = 520) from October 2003 to January 2004. Principal component analysis with varimax rotation was used to determine construct validity. Item-to-total correlations and Cronbach's coefficient alpha were used to determine the scale's internal consistency and unidimensionality. Results., The scale demonstrated high internal consistency (alpha = 0·88). Principal component analysis yielded a four-component structure: Discomfort, Enhancing quality of life, Willingness to be a donor and Rewarding experience. Overall, Korean intensive care unit nurses showed positive attitudes towards organ transplantation, despite some mixed feelings. Conclusion., The attitude scale was reliable and valid for this cohort. Areas were identified where professional development may enhance positive attitudes towards organ transplantation from brain-dead donors. Effective education for intensive care unit nurses is necessary to increase the organ donor pool in Korea. Further research could test the instrument with other populations. [source] Generating Dichotomous Item Scores with the Four-Parameter Beta Compound Binomial ModelJOURNAL OF EDUCATIONAL MEASUREMENT, Issue 3 2007Patrick O. Monahan A Monte Carlo simulation technique for generating dichotomous item scores is presented that implements (a) a psychometric model with different explicit assumptions than traditional parametric item response theory (IRT) models, and (b) item characteristic curves without restrictive assumptions concerning mathematical form. The four-parameter beta compound-binomial (4PBCB) strong true score model (with two-term approximation to the compound binomial) is used to estimate and generate the true score distribution. The nonparametric item-true score step functions are estimated by classical item difficulties conditional on proportion-correct total score. The technique performed very well in replicating inter-item correlations, item statistics (point-biserial correlation coefficients and item proportion-correct difficulties), first four moments of total score distribution, and coefficient alpha of three real data sets consisting of educational achievement test scores. The technique replicated real data (including subsamples of differing proficiency) as well as the three-parameter logistic (3PL) IRT model (and much better than the 1PL model) and is therefore a promising alternative simulation technique. This 4PBCB technique may be particularly useful as a more neutral simulation procedure for comparing methods that use different IRT models. [source] ORIGINAL RESEARCH,OUTCOMES ASSESSMENT: Validation of the Female Sexual Distress Scale-Revised for Assessing Distress in Women with Hypoactive Sexual Desire DisorderTHE JOURNAL OF SEXUAL MEDICINE, Issue 2 2008Leonard DeRogatis PhD ABSTRACT Introduction., The concept of sexually related personal distress is currently central to the diagnosis of all female sexual dysfunctions (FSD). In the current study, we have focused on validating a slightly revised version of the Female Sexual Distress Scale (FSDS), the FSDS-Revised (FSDS-R), to enhance the sensitivity of the instrument with patients suffering from hypoactive sexual desire disorder (HSDD). In addition, we have attempted to extend the validation generalizability of the scale by demonstrating that both instruments possess reliability and discriminative validity in premenopausal women with HSDD. Aim., To assess the validity of the revised version of the FSDS, the FSDS-R, for measuring sexual distress in women with HSDD. Methods., A prospective methodological study carried out at 27 centers in North America enrolled 296 women aged 18,50 years with HSDD, another female sexual dysfunction (FSD), or no FSD. The subjects completed the FSDS-R at baseline, day 7, and day 28, with a 30-day recall at baseline and with a 7-day recall on days 7 and 28. Main Outcome Measures., Receiver operating characteristic (ROC) analyses of FSDS, FSDS-R, and FSDS-R item 13 were used for the differentiation of HSDD from no FSD, while intraclass correlation coefficient (ICC) was used to estimate test,retest reliability. Cronbach's coefficient alpha was used to measure the internal consistency of the FSDS-R and Pearson's correlation coefficient to assess FSDS, FSDS-R, and FSDS-R item 13 with different recall periods (7 and 30 days). Results., Mean total FSDS, FSDS-R, and FSDS-R item 13 scores with either recall period were significantly higher (P < 0.0001) in women with FSD or HSDD than in women with no FSD, showing both tests had discriminant validity. ROC analysis confirmed these findings, while an ICC of >0.74 showed the test,retest reliability of both scales, including FSDS-R item 13 alone, and Cronbach's coefficient alpha of >0.86 confirmed the internal consistency of both tests. Conclusions., Consistent with the FSDS, the FSDS-R demonstrated good discriminant validity, high test,retest reliability, and a high degree of internal consistency in measuring sexually related personal distress in women with HSDD. FSDS-R item 13 alone also demonstrated good discriminant validity and test,retest reliability. DeRogatis L, Clayton A, Lewis-D'Agostino D, Wunderlich G, and Fu Y. Validation of the female sexual distress scale revised for assessing distress in women with hypoactive sexual desire disorder. J Sex Med 2008;5:357,364. [source] Reliability reconsidered: Cronbach's alpha and paediatric assessment in occupational therapyAUSTRALIAN OCCUPATIONAL THERAPY JOURNAL, Issue 3 2009Georgia Spiliotopoulou Background/aim:,Using reliable outcome measures is a necessity for the occupational therapy profession in enabling valid assessments of clients. Although Cronbach's alpha is the most widely applied index of internal consistency reliability, there are misconceptions about its use and interpretation. This paper aims to guide assessment developers in paediatric occupational therapy, as well as practitioners who are evaluating outcome measures in using and interpreting the Cronbach's alpha estimates appropriately. This will enable them to decide on the tools' clinical value and incorporate them into their practice with children. Method:,Previously published papers reporting on internal consistency issues of outcome measures in paediatric occupational therapy were searched through the Allied and Complementary Medicine database. These papers were used as a basis to discuss possible reasons for reporting of low internal consistency. Results:,The analysis demonstrates that Cronbach's alpha reports are not always interpreted in a sound way. The paper emphasises that one should be cautious about judging estimates of internal consistency. Low size of the coefficient alpha might not always indicate problems with the construction of the tool; whereas large sizes do not always suggest adequate reliability. Instead, these reports might be related to the data characteristics of the construct. Conclusion:,In judging an outcome measure's internal consistency, researchers and practitioners in occupational therapy should report and consider the nature of data, the scale's length and width, the linearity and the normality of response distribution, the central response tendency, the sample response variability and the sample size. [source] | ||||||||||