ERIC Number: ED467805
Record Type: Non-Journal
Publication Date: 1999-Mar
Reference Count: N/A
Assessing the Dimensionality of Simulated LSAT Item Response Matrices with Small Sample Sizes and Short Test Lengths. Law School Admission Council Computerized Testing Report. LSAC Research Report Series.
De Champlain, Andre F.
The purpose of this study was to examine empirical Type I error rates and rejection rates for three dimensionality assessment procedures with data sets simulated to reflect short tests and small samples. The TESTFACT G superscript 2 difference test suffered from an inflated Type I error rate with unidimensional data sets, while the approximate chi squared statistic based on a NOHARM analysis did not. Rejection rates with simulated two-dimensional data sets were high for both procedures. The behavior of the G superscript 2 difference test was highly influenced by the independent variables manipulated, which was not the case for the approximate chi squared statistic. The implications of these results for small volume administrations are discussed. (Contains 5 tables and 70 references.) (Author/SLD)
Publication Type: Reports - Research
Education Level: N/A
Authoring Institution: Law School Admission Council, Princeton, NJ.
Identifiers - Assessments and Surveys: Law School Admission Test