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Theoretical Developments (theoretical + development)
Kinds of Theoretical Developments Selected AbstractsCompetitive coexistence in spatially structured environments: a synthesisECOLOGY LETTERS, Issue 12 2003Priyanga Amarasekare Abstract Theoretical developments in spatial competitive coexistence are far in advance of empirical investigations. A framework that makes comparative predictions for alternative hypotheses is a crucial element in narrowing this gap. This review attempts to synthesize spatial competition theory into such a framework, with the goal of motivating empirical investigations that adopt the comparative approach. The synthesis presented is based on a major axis, coexistence in spatially homogeneous vs. heterogeneous competitive environments, along which the theory can be organized. The resulting framework integrates such key concepts as niche theory, spatial heterogeneity and spatial scale(s) of coexistence. It yields comparative predictions that can guide empirical investigations. [source] Testing the Time-Variancy of Explanatory Factors of Strategic Change,BRITISH JOURNAL OF MANAGEMENT, Issue 2 2006José David Vicente-Lorente The article proposes an empirical framework able to: (1) assess the relative validity of both adaptive and inertial views of strategic change and (2) verify the potential time- or context-dependency by testing the structural stability of the empirical model, in Spanish banks, 1983,1997. Results offer inconclusive findings regarding (1) but strong evidence to answer (2). The assumption of structural stability is rejected and the effect of many explanatory factors considered in the empirical model varies over time as some factors show different effects and/or significance levels depending on the period considered. These findings suggest that explanatory models of strategic change should be viewed as ,time-' or ,context-dependent'. The article provides a conceptual model in which alternative explanations operate in a sequential way. The results highlight, first, that inconclusive past findings about adaptive versus inertial views should be reviewed under this new evidence, and future empirical research must assure that its methods and interpretations are robust to potential structural breakdowns; and second, the limitations raised by the static approach offered by the available theories/models when approaching the dynamic and complex nature of strategic change. Theoretical developments and implications for managerial practice are suggested. [source] Evolutionary Economic Geography, Institutions, and Political EconomyECONOMIC GEOGRAPHY, Issue 2 2009Jürgen Essletzbichler abstract In this response to MacKinnon et al. (2009), I argue that the theoretical development of evolutionary economic geographies is necessary in order to evaluate its unique contribution to an understanding of the uneven development of the space economy; that the distinction between evolutionary and institutional economic geographies is overdrawn; that the neglect of class, power, and the state reflect empirical rather than theoretical shortcomings of the evolutionary approach; and that there is significant potential overlap between evolutionary and political economy approaches. [source] Developing Measurement Theory for Classroom Assessment Purposes and UsesEDUCATIONAL MEASUREMENT: ISSUES AND PRACTICE, Issue 4 2003Susan M. Brookhart In many fields of inquiry, the need for new theoretical developments is often best seen in areas of strain, and strain is apparent in several areas in which the conventions of measurement theory do not quite "fit" classroom assessment. Three areas of strain are analyzed in order to suggest how theoretical development might focus directly on information quality in the classroom assessment context. This article describes the context dependence of classroom assessment, its inextricable relationship with instruction, and its simultaneous formative and summative functions. Thus a case is made for new theoretical developments in the area of measurement in the classroom. [source] Embodiment as a unifying perspective for psychologyEUROPEAN JOURNAL OF SOCIAL PSYCHOLOGY, Issue 7 2009Thomas W. Schubert Adaptive action is the function of cognition. It is constrained by the properties of evolved brains and bodies. An embodied perspective on social psychology examines how biological constrains give expression to human function in socially situated contexts. Key contributions in social psychology have highlighted the interface between the body and cognition, but theoretical development in social psychology and embodiment research remain largely disconnected. The current special issue reflects on recent developments in embodiment research. Commentaries from complementary perspectives connect them to social psychological theorizing. The contributions focus on the situatedness of social cognition in concrete interactions, and the implementation of cognitive processes in modal instead of amodal representations. The proposed perspectives are highly compatible, suggesting that embodiment can serve as a unifying perspective for psychology. Copyright © 2009 John Wiley & Sons, Ltd. [source] A mélange of curves , further dialogue about species,area relationshipsGLOBAL ECOLOGY, Issue 6 2004Samuel M. Scheiner ABSTRACT Scheiner (2003) presented a classification of species,area curves into six types based on the pattern of sampling and how the data are combined to form the curves. Gray et al. (2004) contended that five of those types should be termed ,species-accumulation curves', reserving ,species,area curve' for those based on island-type data. Their proposition contradicts 70 years of usage and confounds curves that are area-explicit with those that are area-undefined. In exploring these issues, I highlight additional aspects of species,area and species-accumulation curves, including the assumption of nesting in Type IV (island) curves, how to convert area-unspecified curves into area curves, and the effects of the grain of the analysis on the properties of the curve. Further exploration, theoretical development, and dialogue are needed before we will understand all the biology that species,area curves summarize. [source] A taxonomy of political processes in systems developmentINFORMATION SYSTEMS JOURNAL, Issue 5 2010Rajiv Sabherwal Abstract Significant resources invested in information system development (ISD) are wasted due to political manoeuvres. Prior research on ISD politics has contributed mainly through theoretical development and case studies. This has enhanced understanding of relevant concepts, political tactics and conditions facilitating politics. However, there is limited understanding of the different processes through which politics unfold. This paper uses 89 ISD projects to develop a taxonomy of political processes in ISD. The taxonomy includes three distinct processes: Tug of War, wherein multiple parties strive to gain project control; Obstacle Race, which involves efforts to resist and pursue the project; and Empire Building, wherein the project is used as an instrument to enhance political or resource bases. The taxonomy is explained using the non-proponents' view of the project and the balance of power between system's proponents and non-proponents. We also discuss the emergent taxonomy's implications for how politics can be managed and studied. [source] Global formulation of 3D magnetostatics using flux and gauged potentialsINTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 4 2004M. Repetto Abstract The use of algebraic formulation for the solution of electromagnetic fields is becoming more and more widespread. This paper presents the theoretical development of two algebraic formulations of the magneto-static problem and their implementation in a three dimensional computational procedure based on an unstructured tetrahedral mesh. A complete description of the variables used and of the solution algorithm is provided together with a discussion about the performances of the method. The performances of the two procedures are tested and assessed versus cases with known solutions. Copyright © 2004 John Wiley & Sons, Ltd. [source] Model reference adaptive iterative learning control for linear systemsINTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING, Issue 9 2006A. Tayebi Abstract In this paper, we propose a model reference adaptive control (MRAC) strategy for continuous-time single-input single-output (SISO) linear time-invariant (LTI) systems with unknown parameters, performing repetitive tasks. This is achieved through the introduction of a discrete-type parametric adaptation law in the ,iteration domain', which is directly obtained from the continuous-time parametric adaptation law used in standard MRAC schemes. In fact, at the first iteration, we apply a standard MRAC to the system under consideration, while for the subsequent iterations, the parameters are appropriately updated along the iteration-axis, in order to enhance the tracking performance from iteration to iteration. This approach is referred to as the model reference adaptive iterative learning control (MRAILC). In the case of systems with relative degree one, we obtain a pointwise convergence of the tracking error to zero, over the whole finite time interval, when the number of iterations tends to infinity. In the general case, i.e. systems with arbitrary relative degree, we show that the tracking error converges to a prescribed small domain around zero, over the whole finite time interval, when the number of iterations tends to infinity. It is worth noting that this approach allows: (1) to extend existing MRAC schemes, in a straightforward manner, to repetitive systems; (2) to avoid the use of the output time derivatives, which are generally required in traditional iterative learning control (ILC) strategies dealing with systems with high relative degree; (3) to handle systems with multiple tracking objectives (i.e. the desired trajectory can be iteration-varying). Finally, simulation results are carried out to support the theoretical development. Copyright © 2006 John Wiley & Sons, Ltd. [source] A review of international human resource management: Integration, interrogation, imitationINTERNATIONAL JOURNAL OF MANAGEMENT REVIEWS, Issue 4 2007Helen De Cieri International human resource management (IHRM) represents an important dimension of international management. Over the past three decades, there has been considerable growth in research and practice in IHRM. While there have been extensive developments in this field, numerous scholars have identified aspects requiring review and revision. Hence, this paper reviews and interrogates the progress in IHRM's theoretical development. The review leads to the conclusion that research in IHRM has tended to emphasize integration over other forms of progress. In response, and in provocation, imitation rather than integration is suggested as an approach for the development of future theoretical and conceptual directions in IHRM. [source] "Quasi Track-One" Diplomacy: An Analysis of the Geneva Process in the Israeli,Palestinian Conflict,INTERNATIONAL STUDIES PERSPECTIVES, Issue 2 2010Amira Schiff The diversity of unofficial diplomacy activities in the last three decades has led to extensive attention in theoretical literature to the role of unofficial diplomacy in conflict resolution processes and to the development of a broad range of concepts used to describe different types of unofficial diplomatic activities. Yet certain unofficial activities, such as the process that preceded the Geneva Accords, do not neatly conform to the prevailing unofficial diplomacy concepts. This study seeks to contribute to the theoretical development of the unofficial diplomacy theory through an examination of the assumptions underlying models and concepts relating to unofficial diplomacy as applied to the process leading to the drafting of the Geneva Accords. The study suggests that the unofficial diplomacy process leading to the Geneva Accords was in fact "a quasi track-one" diplomacy,a diplomacy characterized by unique features, some of which weakened its potential contribution to the policy-making process. [source] Unpacking the concept of patient satisfaction: a feminist analysisJOURNAL OF ADVANCED NURSING, Issue 3 2005Sheila A. Turris MSN RN Aim., The aim of this paper is to present a feminist critique of the concept of patient satisfaction. Background., Fiscal restraint, health care restructuring, shifting demographics, biomedical technological advances, and a significant shortage of health care professionals are stretching health care systems across North America to the breaking point. A simultaneous focus on consumerism and health service accountability is placing additional pressure on the system. The concept of patient satisfaction, with roots in the consumer movement of the 1960s, has both practical and political relevance in the current health care system and is commonly used to guide research related to consumer experiences of health care. Because the quality of health care encounters may lead to treatment-seeking delays, patient satisfaction research may be an effective vehicle for addressing this public health issue. However, there is wide agreement that patient satisfaction is an under-theorized concept. Using current conceptualizations of patient satisfaction, we end up all too often producing a checklist approach to ,achieving' patient satisfaction, rather than developing an understanding of the larger issues underlying individual experiences of health care. We focus on the symptoms rather than the problems. Discussion., Without further theoretical refinement, the results of research into patient satisfaction are of limited use. To push forward theoretical development we might apply a variety of theoretical lenses to the analysis of both the concept and the results of patient satisfaction research. Feminism, in particular, offers a perspective that may provoke further refinement of patient satisfaction as a concept. Conclusions., Without a deeper understanding of the values and beliefs (or the worldview) that informs our approaches to researching patient satisfaction, researchers will be reacting to the most obvious indicators and failing to address the underlying issues related to individual experiences of health care. [source] Metasynthesis: withdrawing life-sustaining treatments: the experience of family decision-makersJOURNAL OF CLINICAL NURSING, Issue 2 2009Mary Ann Meeker Aim., The present study was undertaken to synthesise findings from qualitative investigations of family participation in decisions to withdraw and/or withhold life-sustaining treatment from a seriously ill family member. Background., As a consequence of increasing effectiveness and sophistication of available medical interventions, death is commonly preceded by a decision to withdraw or withhold potentially life-sustaining treatments. These decisions take place in a bioethical context characterised by the preeminence of self-determination, but patients are typically too ill to make their own decisions. Thus, family members are called upon to participate in these morally consequential decisions on the patient's behalf. Design., Metasynthesis Method., Metasynthesis is a form of inquiry that provides for integration of qualitative studies' findings to strengthen knowledge for practice and advance theoretical development. This metasynthesis was conducted using the constant comparative methods of grounded theory. Results., Family members engage in a process of participation in decision-making that is comprised of three major categories: reframing reality, relating and integrating. Surrogates used both cues and information as they reframed their understanding of the patient's status. Relationships with providers and with other family members powerfully influenced the decision-making process. Integrating was characterised by reconciling and going forward. This part of the process has both intrapersonal and interpersonal aspects and describes how family decision-makers find meaning in their experience and move forward in their lives. Conclusions., This synthesis provides a more comprehensive and empirically supported understanding of family members' experiences as they participate in treatment decisions for dying family members. Relevance to clinical practice., This metasynthesis provides evidence to improve family care during treatment withdrawal/withholding decision-making and a theoretical model that can be used to guide creation of clinical practice guidelines. Through increased understanding of family members' experiences, clinicians can more effectively support family decision-making processes. [source] Is there a ,New Managerial Work'?JOURNAL OF MANAGEMENT STUDIES, Issue 7 2006A Comparison with Henry Mintzberg's Classic Study 30 Years Later abstract This comparative study of top executives' work aimed at examining the stability of top managerial behaviour reveals a relatively different pattern of behaviour compared with the study by Henry Mintzberg. The main differences are a much larger workload, a contact pattern to a larger degree oriented towards subordinates in group-settings, a greater emphasis on giving information, and less preoccupation with administrative work. One important finding is that fragmentation of time , in previous studies highlighted as a central tenet of managerial work , was not as prevalent in the new study. The different results can be attributed (with caution) to the impact of the management discourse about leadership and corporate culture, and to factors such as organizational structure and geographical dispersion of companies. However, there are also significant similarities between the two studies which indicate that claims of the emergence of a radically different managerial work are much exaggerated. Instead the empirical data shows that new work-practices are combined with older practices, both in a complex and context-specific ways. Therefore, there is a need for better integration between theoretical development and empirical investigations in this field of inquiry. [source] An International Imperative for Gender-Sensitive Theories in Women's HealthJOURNAL OF NURSING SCHOLARSHIP, Issue 4 2001Eun-Ok Im Purpose: To propose gender-sensitive theories as a future direction for theoretical development of women's health. Few theories pertain to women's health and illness experiences, with gender issues embedded in social, cultural, and historical contexts. Organizing Construct: Significance, definition, and philosophical bases of gender-sensitive theories. Findings: Six major components should be incorporated in the development of gender-sensitive theories: (a) gender as a major feature, (b) women's own words and experiences, (c) nature of women's experiences, (d) theorists' perspectives, (e) contexts, and (f) guidelines for actions. Conclusions: We believe that the development of gender-sensitive theories in nursing could enable researchers to transcend androcentric and ethnocentric views on women's health, decrease gender inequity in health care, enhance women's well being, and ultimately contribute to knowledge development in nursing. [source] Methodological aspects of rigor in qualitative nursing research on families involved in intensive care units: A literature reviewNURSING & HEALTH SCIENCES, Issue 1 2007Sevald Høye rn, mnsc Abstract, Rigor has important ramifications for the entire qualitative research process. The aim of this study was to evaluate aspects of methodological congruence by focusing on four dimensions of rigor in qualitative nursing research related to the presence of patients' family members in the intensive care unit. Eight research papers covering the years 1990,2004 were analyzed by means of one of Burns and Grove's standards, methodological congruence, for critique and consistency. The results show that there are varying degrees of focus on procedural rigor, such as limitations and bias. Ethical rigor is described clearly in some papers, while others lack descriptions of confidentiality and the voluntary nature of participation. However, all papers contain descriptions of qualitative data analysis. In conclusion, there were strengths in procedural rigor and auditability, but also some limitations in the identification of theoretical development and the scientific tradition on which the article is based. [source] Correlation of peel and burst tests for pouchesPACKAGING TECHNOLOGY AND SCIENCE, Issue 2 2001Rosamari Feliú-Báez Abstract Theoretical equations based on force diagrams were developed in order to explain pouch behaviour during a restrained burst test. According to the resulting equation, P,=,2 S/D, the burst pressure (P) increases directly with seal strength (S) and inversely with the distance between the restraining plates (D). After performing a restrained burst test and a peel test on Tyvek/plastic pouches, it was found that the theoretical development did not exactly explain burst test results in terms of peel test values. The test results demonstrate that even though the peeling times for the peel and burst tests were controlled to be the same, the theoretical formula (P,=,2 S/D) tends to overestimate the burst pressure. The overestimation increases at smaller gaps. These results are an indication that the formula is not universal and they suggest that it is an oversimplification. It might work for some materials at a particular set of testing conditions but not for others. Copyright © 2001 John Wiley & Sons, Ltd. [source] SATISFACTION, CITIZENSHIP BEHAVIORS, AND PERFORMANCE IN WORK UNITS: A META-ANALYSIS OF COLLECTIVE CONSTRUCT RELATIONSPERSONNEL PSYCHOLOGY, Issue 1 2010DANIEL S. WHITMAN This paper offers theoretical development clarifying the structure and function of collective job satisfaction and uses meta-analytic methods (k,= 73) to examine the satisfaction,performance relationship when both constructs are construed at the work unit level. Overall, our results suggest that the relationship between unit-level job satisfaction and unit-level performance is significant (,= .34). Specifically, significant relationships were found between unit-level job satisfaction and unit-level criteria, including productivity, customer satisfaction, withdrawal, and organizational citizenship behaviors (OCB). Furthermore, the satisfaction-performance relationship was moderated by the strength of unit consensus, performance criteria, industry type, and whether the sample was U.S. based. Although these moderators were identified, collective satisfaction positively predicted performance across all levels of moderators. In addition, results indicate that unit-level OCB has a moderately strong relationship with unit-level performance. Only limited support was found for the notion that OCB is a route through which satisfaction has an impact on performance. We elaborate on these findings and attempt to provide a more clear direction for future research in this area. [source] Linking intrinsic motivation, risk taking, and employee creativity in an R&D environmentR & D MANAGEMENT, Issue 3 2007Todd Dewett Intrinsic motivation is thought to spur risk taking and creativity. Nonetheless, the relationship between common creativity antecedents and intrinsic motivation is seldom clarified and the assertion that intrinsic motivation spurs risk taking and creativity has rarely been addressed. The current study adopts an individual level of analysis and attempts to link several common creativity antecedents, intrinsic motivation, and one's willingness to take risks to employee creativity. Using survey data collected from 165 research and development personnel and their supervisors, evidence is provided showing that intrinsic motivation mediates the relationship between certain antecedents and one's willingness to take risks and that this willingness mediates the effect of intrinsic motivation on employee creativity. However, starkly different findings emerge when using subjective versus objective indicators of employee creativity, suggesting that further theoretical development is in order to explain the differences. [source] Interpersonal trust and voluntary associations: examining three approachesTHE BRITISH JOURNAL OF SOCIOLOGY, Issue 3 2002Helmut Anheier ABSTRACT The relationship between interpersonal trust and membership in voluntary associations is a persistent research finding in sociology. What is more, the notion of trust has become a central issue in current social science theorizing covering such diverse approaches as transaction costs economics or cognitive sociology. In different ways and for different purposes, these approaches address the role of voluntary organizations, although, as this paper argues, much of this thinking remains sketchy and underdeveloped. Against an empirical portrait of this relationship, the purpose of this paper is to assess such theorizing. We first set out to explicate major approaches to trust in economics, sociology and political science, using the non-profit or voluntary organization as a focal point. We then examine the various approaches in terms of their strengths and weaknesses, and, finally, identify key areas for theoretical development. In particular, we point to the social movement literature, the social psychology of trust, and recent thinking about civil society. [source] Implementation of Design of Experiments projects in industryAPPLIED STOCHASTIC MODELS IN BUSINESS AND INDUSTRY, Issue 4 2009Martín Tanco Abstract Although design of experiments (DoE) is a common feature of statistics and quality literature, it is insufficiently used in industry. Surveys and numerous articles alike have verified that a gap exists between theoretical development and its effective application in industry. Therefore, we have developed a complete, friendly and easy-to use methodology, from an engineering point of view, to ease the implementation of DoE in companies. Our approach presents a framework for the experimentation process that follows the traditional DMAIC steps of ,Six Sigma' as a generic problem solving methodology. We aim to present a complete overview of the experimentation process useful for those engineers, statisticians and scientists who are not experts in DoE. Copyright © 2009 John Wiley & Sons, Ltd. [source] Charting the future course of rural health and remote health in Australia: Why we need theoryAUSTRALIAN JOURNAL OF RURAL HEALTH, Issue 2 2010Lisa Bourke Abstract Objective:,This paper argues that rural and remote health is in need of theoretical development. Design:,Based on the authors' discussions, reflections and critical analyses of literature, this paper proposes key reasons why rural and remote health warrants the development of theoretical frameworks. Results:,The paper cites five reasons why theory is needed: (i) theory provides an approach for how a topic is studied; (ii) theory articulates key assumptions in knowledge development; (iii) theory systematises knowledge, enabling it to be transferable; (iv) theory provides predictability; and (v) theory enables comprehensive understanding. Conclusion:,This paper concludes with a call for theoretical development in both rural and remote health to expand its knowledge and be more relevant to improving health care for rural Australians. [source] Relationship Development and Workplace Integration: An Evolutionary PerspectiveCOMMUNICATION THEORY, Issue 4 2005JC. Bruno Teboul In this article, the authors argue that recent scholarship emanating from the field of evolutionary psychology (EP) promises to further current understanding of relationship development processes in organizations. To this end, they briefly review EP's core assumptions about human nature and behavior and then examine three adaptive mechanisms that underlie close relational functioning in the workplace. Specifically, the authors describe how reciprocal altruism and preference for similarity, coupled with sensitivity toward prestige hierarchies, underscore the exchange and coordination activities of employees' relationships at work. The proposed model of relationship development is discussed in terms of employee adjustment and integration processes. In conclusion, the authors highlight the potential of EP as both (a) a metatheoretic framework through which seemingly disparate areas of scholarship can be unified, and (b) a vehicle for theoretical development, a catalyst of novel predictions about communication in organizations, grounded in ultimate, rather than proximate, causation. [source] Impulsive Dirac-delta forces in the rocking motionEARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS, Issue 7 2004F. Prieto Abstract In this work the classical theory of one block rocking motion is revisited. A Dirac-delta type interaction as impact mechanism is found to be an alternative for the traditional model. Numerical computations with this new formulation have shown that the agreement with the classical theory is excellent for the case of slender blocks and small displacements. Good agreement with experimental data has also been found for the case of arbitrary angles and slenderness. The approach presented in this paper opens new lines for further theoretical developments and computational applications. Copyright © 2004 John Wiley & Sons, Ltd. [source] Taking species abundance distributions beyond individualsECOLOGY LETTERS, Issue 6 2009Hélène Morlon Abstract The species abundance distribution (SAD) is one of the few universal patterns in ecology. Research on this fundamental distribution has primarily focused on the study of numerical counts, irrespective of the traits of individuals. Here we show that considering a set of Generalized Species Abundance Distributions (GSADs) encompassing several abundance measures, such as numerical abundance, biomass and resource use, can provide novel insights into the structure of ecological communities and the forces that organize them. We use a taxonomically diverse combination of macroecological data sets to investigate the similarities and differences between GSADs. We then use probability theory to explore, under parsimonious assumptions, theoretical linkages among them. Our study suggests that examining different GSADs simultaneously in natural systems may help with assessing determinants of community structure. Broadening SADs to encompass multiple abundance measures opens novel perspectives in biodiversity research and warrants future empirical and theoretical developments. [source] When density dependence is not instantaneous: theoretical developments and management implicationsECOLOGY LETTERS, Issue 2 2008Irja I. Ratikainen Abstract Most organisms live in changing environments or do not use the same resources at different stages of their lives or in different seasons. As a result, density dependence will affect populations differently at different times. Such sequential density dependence generates markedly different population responses compared to the unrealistic assumption that all events occur simultaneously. Various field studies have also shown that the conditions that individuals experience during one period can influence success and per capita vital rates during the following period. These carry-over effects further complicate any general principles and increase the diversity of possible population dynamics. In this review, we describe how studies of sequential density dependence have diverged in directions that are both taxon-specific and have non-overlapping terminology, despite very similar underlying problems. By exploring and highlighting these similarities, we aim to improve communication between fields, clarify common misunderstandings, and provide a framework for improving conservation and management practices, including sustainable harvesting theory. [source] Developing Measurement Theory for Classroom Assessment Purposes and UsesEDUCATIONAL MEASUREMENT: ISSUES AND PRACTICE, Issue 4 2003Susan M. Brookhart In many fields of inquiry, the need for new theoretical developments is often best seen in areas of strain, and strain is apparent in several areas in which the conventions of measurement theory do not quite "fit" classroom assessment. Three areas of strain are analyzed in order to suggest how theoretical development might focus directly on information quality in the classroom assessment context. This article describes the context dependence of classroom assessment, its inextricable relationship with instruction, and its simultaneous formative and summative functions. Thus a case is made for new theoretical developments in the area of measurement in the classroom. [source] On the construction of multivariate extreme value models via copulasENVIRONMETRICS, Issue 2 2010F. Durante Abstract Copulas represent a fundamental tool for constructing multivariate probability distributions. Exploiting recent theoretical developments concerning the construction of copulas, we outline several methods for generating multivariate extreme value (MEV) laws having a suitable number of parameters, a feature of great importance in applications. The corresponding random vectors can be efficiently simulated, and easily fitted to empirical data. The use of multivariate return periods for extreme events is also discussed. A practical illustration involving maxima sampled via a network of non-independent gauge stations is presented. Copyright © 2009 John Wiley & Sons, Ltd. [source] Empirical Bayes estimators and non-parametric mixture models for space and time,space disease mapping and surveillanceENVIRONMETRICS, Issue 5 2003Dankmar Böhning Abstract The analysis of the geographic variation of disease and its representation on a map is an important topic in epidemiological research and in public health in general. Identification of spatial heterogeneity of relative risk using morbidity and mortality data is required. Frequently, interest is also in the analysis of space data with respect to time, where typically data are used which are aggregated in certain time windows like 5 or 10 years. The occurrence measure of interest is usually the standardized mortality (morbidity) ratio (SMR). It is well known that disease maps in space or in space and time should not solely be based upon the crude SMR but rather some smoothed version of it. This fact has led to a tremendous amount of theoretical developments in spatial methodology, in particular in the area of hierarchical modeling in connection with fully Bayesian estimation techniques like Markov chain Monte Carlo. It seems, however, that at the same time, where these theoretical developments took place, on the practical side only very few of these developments have found their way into daily practice of epidemiological work and surveillance routines. In this article we focus on developments that avoid the pitfalls of the crude SMR and simultaneously retain a simplicity and, at least approximately, the validity of more complex models. After an illustration of the typical pitfalls of the crude SMR the article is centered around three issues: (a) the separation of spatial random variation from spatial structural variation; (b) a simple mixture model for capturing spatial heterogeneity; (c) an extension of this model for capturing temporal information. The techniques are illustrated by numerous examples. Public domain software like Dismap is mentioned that enables easy mixture modeling in the context of disease mapping. Copyright © 2003 John Wiley & Sons, Ltd. [source] Cooperative forms of governance: Problems of democratic accountability in complex environmentsEUROPEAN JOURNAL OF POLITICAL RESEARCH, Issue 4 2003YANNIS PAPADOPOULOS Various schools of research in public policy (the literature on ,governance' and its continental counterparts) are converging to focus on the growth of policy styles based on cooperation and partnership in networks, instead of on vertical control by the state. This article focuses on issues of democratic accountability and responsiveness with these governance arrangements. It argues that until recently the legitimacy of governance networks was not at the forefront of theoretical developments, even though the ,democratic deficit' of governance is problematic both for normative and for pragmatic reasons. There is now increased sensitivity to this problem, but the remedies presented in the literature are unsatisfactory, and critiques of governance presuppose a somewhat idealised image of representative democracy in terms of accountability or responsiveness of decision-makers. They also fail to offer adequate solutions to some of the central legitimacy problems of policy-making in complex societies. [source] | ||||||||||||||||||||||||||||||||||