Factors effecting the model performance measures area under the ROC curve,net reclassification improvement and integrated discrimination improvement

ABSTRACT

The aim of this study is to investigate the impact of correlation structure, prevalence and effect size on the risk prediction model by using the change in the area under the receiver operating characteristic curve (ΔAUC), net reclassification improvement (NRI), and integrated discrimination improvement (IDI). In simulation study, the dataset is generated under different correlation structures, prevalences and effect sizes. We verify the simulation results with the real-data application. In conclusion, the correlation structure between the variables should be taken into account while composing a multivariable model. Negative correlation structure between independent variables is more beneficial while constructing a model.     

Varieties of Entrepreneurial Capitalism: The Culture of Entrepreneurship and Structural Inequalities of Work and Business Creation

As the labor market has changed over recent decades, a distinctive culture has evolved in tandem, epitomized by the innovation and dynamism of Silicon Valley. This culture of entrepreneurship celebrates autonomy and risk‐taking, legitimizes a shift toward flexible, contingent, and precarious work, and compels workers to continuously network, self‐improve, and self‐promote. This culture has helped to disseminate entrepreneurial practices to sectors of the economy traditionally characterized by stability and job security. We shed light on these changes by putting forward a new typology distinguishing between four ideal types of entrepreneurial activity: Silicon Valley entrepreneurship, Main Street entrepreneurship, corporate entrepreneurship, and entrepreneurial self‐employment. Each adopts the language and normative behaviors of the culture of entrepreneurship, but the ‘entrepreneurs’ working within these domains enjoy starkly different levels of creative and financial autonomy. Integrating scholarship on economic sociology, work and labor, cultural sociology, and critical theory, we explore the underlying dynamics of entrepreneurship that cut across institutional contexts in unexpected and sometimes contradictory ways. The conceptual understanding of entrepreneurship we put forward recognizes both entrepreneurship's relationship to past forms of business creation and its contemporary cultural influence, while also underscoring the various constraints and inequalities intrinsic to these forms of market activity.     

The leveling of divorce in the united states

Is the recent plateau in crude divorce rates due to compositional changes in the married population or to a fundamental change in the long-term trend of rising marital instability? I use refined measures of period divorce rates to show that the leveling of divorce rates appears to be real. Compositional factors do little to explain the end to the more than century-long pattern of rising divorce. Increases in cohabitation also fail to explain the plateau. New theories are needed to explain the determinants of divorce rates at the population level.     

Mother Emotion,Child Temperament,and Young Children's Helpless Responses to Failure

Young children differ in their responses to failure, displaying mastery or helpless behavior patterns. We examine the moderating role of child temperament on the association between parent warmth/negativity and children's helpless responses to failure. Regarding temperament, we focus on tendencies to experience interest and sadness because they entail task engagement and withdrawal, respectively. We measured mother (n=150) expressions of positive and negative emotion during a teaching task, assessed temperament using LabTAB‐Preschool episodes, and coded helplessness during an impossible puzzle task. Maternal negative emotion during teaching was positively associated with helplessness, but only for children low in interest. Maternal warmth was negatively associated with helplessness, but only for children high in sadness; sadness did not moderate the relation between maternal negativity and helplessness. Findings provide support for parenting by temperament goodness‐of‐fit models and for a discrete emotions approach to temperament.     

Refusal skills: learning to be positively negative

Many youth wishing to refuse drugs or alcohol offered to them are deficient in the interpersonal abilities which constitute such refusal skills. This article describes Skillstreaming, an interpersonal skill training approach of apparent effectiveness when used for such behavioral enhancement purposes. Presented are its constituent training procedures, specific skills content, and methods for promoting the transfer and maintenance of skill competence in real-world, refusal-relevant situations.     

The Asbestos Case: A Comment on the Appointment and Use of Nonpartisan Experts in World Trade Organization Dispute Resolution Involving Health Risk

The World Trade Organization is currently evolving its approach to incorporating scientific and technological evidence into its dispute-resolution process. In European Communities-Measures Affecting Asbestos and Asbestos-Containing Products, the Panel was faced with a large amount of complex and conflicting scientific evidence presented by the partisan experts. The Asbestos Panel's solution was to appoint independent, nonpartisan experts to help it understand and evaluate the scientific evidence. While this was far better than trying to unravel the conflicting scientific evidence on its own, two aspects of the Panel's adopted procedure merit scrutiny. First, the expert-selection process used by the Panel may not assure that the collective expertise of the appointed experts is broad enough when the dispute involves multidisciplinary scientific issues. Second, the process adopted by the Panel for consulting the appointed experts-which involved individual consultation rather than a consensus process-may leave a panel with a distorted or confused picture of the science. A consensus approach is the best means of obtaining scientific advice from appointed experts; it is most calculated to provide a clear and accurate report of the scientific information needed by a panel to make a fair and informed decision on the dispute before it. The underlying principle of world trade agreements is that it is beneficial to all of us to have free trade. Among other things, this requires an effective means of resolving disputes, and increasingly that includes disputes involving complex scientific and technological issues. This can be achieved only if the parties have confidence that their disputes will be decided in a fair and informed manner, based on the best science available. To achieve this goal, we suggest that future WTO panels depart in certain respects from the procedures utilized by the Asbestos Panel.