With the widespread use of computers in modern assessment, online calibration has become increasingly popular as a way of replenishing an item pool. The present study discusses online calibration strategies for a joint model of responses and response times. The study proposes likelihood inference methods for item paramter estimation and evaluates…

Because of concerns about test security, different test forms are typically used across different testing occasions. As a result, equating is necessary in order to get scores from the different test forms that can be used interchangeably. In order to assure the quality of equating, multiple equating methods are often examined. Various equity…

Propensity score estimation plays a fundamental role in propensity score matching for reducing group selection bias in observational data. To increase the accuracy of propensity score estimation, the author developed a bootstrap propensity score. The commonly used propensity score matching methods: nearest neighbor matching, caliper matching, and…

This report examines the differences in impact estimates and standard errors that arise when these are derived using state achievement tests only (as pre-tests and post-tests), study-administered tests only, or some combination of state- and study-administered tests. State tests may yield different evaluation results relative to a test that is…

Bayesian methods for estimating dose response curves in quantal bioassay are studied. A linearized multi-stage model is assumed for the shape of the curves. A Gibbs sampling approach with data augmentation is employed to compute the Bayes estimates. In addition, estimation of the "relative additional risk" and the "risk specific…

This report based on the March 1985 supplement to the Current Population Survey presents demographic, social, and economic data on the Hispanic population in the United States, and focuses on social and economic changes between 1982 and 1985. The Hispanic civilian noninstitutional population in March 1985 totaled about 17 million, a 17% increase…

This advance report based on the March 1988 supplement to the Current Population Survey (CPS) presents preliminary data on selected demographic, social, and economic characteristics of the Hispanic population of the United States. The Hispanic civilian noninstitutional population in March 1988 totaled about 19.4 million, a 34% increase since 1980;…