Psychometrika - Time limits are imposed on many computer-based assessments, and it is common to observe examinees who run out of time, resulting in missingness due to not-reached items. The present... 相似文献
The aim of latent variable selection in multidimensional item response theory (MIRT) models is to identify latent traits probed by test items of a multidimensional test. In this paper the expectation model selection (EMS) algorithm proposed by Jiang et al. (2015) is applied to minimize the Bayesian information criterion (BIC) for latent variable selection in MIRT models with a known number of latent traits. Under mild assumptions, we prove the numerical convergence of the EMS algorithm for model selection by minimizing the BIC of observed data in the presence of missing data. For the identification of MIRT models, we assume that the variances of all latent traits are unity and each latent trait has an item that is only related to it. Under this identifiability assumption, the convergence of the EMS algorithm for latent variable selection in the multidimensional two-parameter logistic (M2PL) models can be verified. We give an efficient implementation of the EMS for the M2PL models. Simulation studies show that the EMS outperforms the EM-based L1 regularization in terms of correctly selected latent variables and computation time. The EMS algorithm is applied to a real data set related to the Eysenck Personality Questionnaire. 相似文献
Work is frequently on the minds of employees—even during evenings, weekends, and vacations. The present study is the first comprehensive meta-analysis of off-job work-related thoughts (WRTs; i.e., thoughts employees have about work when they are not at work). We were particularly interested in comparing off-job positive and negative work-related thoughts (PWRTs and NWRTs; i.e., thoughts about positive/negative work experiences or characteristics) to each other and other off-job WRT constructs, which we integrated into a typology. We coded 520 effect sizes from 171 independent samples (N = 58,682) and conducted a random-effects, individual-correction meta-analysis. We found that PWRTs and NWRTs were unrelated, and psychological detachment was negatively related to NWRTs but unrelated to PWRTs. Furthermore, PWRTs and NWRTs exhibited significantly different relationships with various antecedents (e.g., age, negative affectivity) and outcomes (e.g., work engagement, burnout). Compared to PWRTs and NWRTs, psychological detachment and problem-solving pondering exhibited generally weaker relationships with outcomes. NWRTs contaminated with negative affective strains (i.e., negative work-related thoughts and feelings) exhibited generally stronger relationships with outcomes. Overall, our meta-analytic findings indicate that PWRTs and NWRTs are different and underscore the importance of empirically and conceptually separating PWRTs and NWRTs from each other and other off-job WRT constructs. The findings also complement the nascent literature on interventions that target promoting PWRTs and reducing NWRTs.
Social Psychology of Education - Academic self-efficacy, self-esteem, and grit (i.e., perseverance of effort and consistency of interests) have all separately shown to predict academic success... 相似文献