This article describes the results of a simulation study to investigate the impact of missing data on the detection of differential item functioning (DIF). Specifically, it investigates how four methods for dealing with missing data (listwise deletion, zero imputation, two-way imputation, response function imputation) interact with two methods of…

The interrelationships among halo and leniency rating errors were examined using simulated rating data. As leniency increased, halo decreased when measured by dimension intercorrelations but increased when measured by standard deviations across dimensions. Implications of these results for the use of the various measures are discussed. (SLD)

A problem of considerable importance in certain educational settings is determining how many items to include on a mastery test. Applying ranking and selection procedures, a solution is given which includes as a special case all existing single-stage, non-Bayesian solutions based on a strong true-score model. (Author/JKS)

A number of empirical studies are suggested to answer certain questions in connection with flexilevel tests. (MS)

The efficacy of 5 scales of the Minnesota Multiphasic Personality Inventory-2 (MMPI-2) in detecting fake good, fake bad, and honest profiles was investigated for 110 undergraduate students instructed to fake good, fake bad, or respond honestly. An analysis of variance suggests that these validity scales are useful. (SLD)