This article proposes that sampling design effects have potentially huge unrecognized impacts on the results reported by large-scale district and state assessments in the United States. When design effects are unrecognized and unaccounted for they lead to underestimating the sampling error in item and test statistics. Underestimating the sampling…

This study investigated the application of multidimensional item response theory (IRT) models to validate test structure and dimensionality. Multiple content areas or domains within a single subject often exist in large-scale achievement tests. Such areas or domains may cause multidimensionality or local item dependence, which both violate the…

In developing countries, for the most part, traditional methods of selecting students for secondary schools, technical and vocational institutions, teacher training colleges, and universities are unable to ensure that the most capable applicants receive the limited opportunities available. To remedy this situation, the author has assembled and…

Latent trait model calibration procedures were used on data obtained from a group testing program. The one-parameter model of Wright and Panchapakesan and the three-parameter logistic model of Wingersky, Wood, and Lord were selected for comparison. These models and their corresponding estimation procedures were compared, using actual and simulated…

This bulletin attempts to explain the use and limitations of regularly the process of selecting educational areas which should receive additional interpret adequately their meaning to parents and students. A companion publication "Understanding Testing Purposes and Interpretations for Pupil Development," also prepared by HEW, was issued in 1960. A…