Product Description: BIMAIN is a special form of the BILOG program designed to detect and estimate item parameter drift (DRIFT) and differential item functioning (DIF). Extremely versatile, BIMAIN is essentially a multiple-group BILOG. The groups correspond to successive cohorts of respondents when DRIFT is studied and to separate demographic groups when DIF is studied...read more

Product Description: The PARSCALE program extends item response theoretic (IRT) measurement methods to multiple-category rating scale items. It provides efficient scaling of data obtained in: * Surveys of social attitudes and opinions; * Psychological evaluations based on personality inventories and self reports; * Ratings of the clinical status of patients in therapy; * Individually-administered cognitive tests in which the interviewer rates the quality of each response; and * Educational achievement testing and assessment based on ratings of constructed-response exercises, including essay questions, open-ended problem solving, and performance tasks In educational testing applications, the program can analyze tests consisting of both rating scale items and multiple choice items subject to guessing effects...read more

Product Description: Based upon a large body of factual information,a critical view of the cognitive skills and potentials of young people in the United States in the 1980s. The data is analyzed using the most current statistical techniques and discussed from a broad psychological, sociological and educational perspective...read more