A method for selecting between K-dimensional linear factor models and (K + 1)-class latent profile models is proposed. In particular, it is shown that the conditional covariances of observed variables are constant under factor models but nonlinear functions of the conditioning variable under latent profile models. The performance of a convenient…

Proposes an item-selection algorithm for neutralizing the differential effects of time limits on computerized adaptive test scores. Uses a statistical model for distributions of examinees' response times on items in a bank that is updated each time an item is administered. Demonstrates the method using an item bank from the Armed Services…

The Department of Defense is developing norms for its Armed Services Vocational Aptitude Battery (ASVAB) and the newly created Interest Finder, a vocational interest inventory. The normative effort, called the 1997 Profile of American Youth (PAY97), will be undertaken as part of the Bureau of Labor Statistics' 1997 National Longitudinal Survey of…