Variable screening has emerged as a crucial first step in the analysis of high-throughput data, but existing procedures can be computationally cumbersome, difficult to justify theoretically, or inapplicable to certain types of analyses. Motivated by a high-dimensional censored quantile regression problem in multiple myeloma genomics, this article makes three contributions. First, we establish a...

The PISA 2006, 2009, 2012 and 2015 assessments use the same science performance scale, which means that score points on this scale are directly comparable over time. The same is true for the reading performance scale used since PISA 2000 and the mathematics performance scale used since PISA 2003. Comparisons of scores across time are possible because some items are common across assessments and...

Many studies have investigated the topic of change or drift in item parameter estimates in the context of item response theory (IRT). Content effects, such as instructional variation and curricular emphasis, as well as context effects, such as the wording, position, or exposure of an item have been found to impact item parameter estimates. The issue becomes more critical when items with estimat...

Consistent behavior is a desirable characteristic that common items are expected to have when administered to different groups. Findings from the literature have established that items do not always behave in consistent ways; item indices and IRT item parameter estimates of the same items differ when obtained from different administrations. Content effects, such as discrepancies in instructiona...

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The aim of the study was to examine common items in mixed format (e.g., multiple-choices and essay items) contain parameter drifts test equating processes performed with item non-equivalent groups design. In this study, which carried out using Monte Carlo simulation a fully crossed design, factors length (30 50), sample size (1000 3000), ratio 40%), drift (IPD) (20 30%), location tests (at begi...