Accession Number : AD0668024

Title :   ESTIMATING ITEM CHARACTERISTIC CURVES WITHOUT KNOWLEDGE OF THEIR MATHEMATICAL FORM,

Corporate Author : EDUCATIONAL TESTING SERVICE PRINCETON N J

Personal Author(s) : Lord,Frederick M.

Report Date : FEB 1968

Pagination or Media Count : 16

Abstract : A method is outlined for estimating item characteristic curves without knowledge of their mathematical form. For illustrative purposes, the method is applied to five items from a regular test administration. Previously, curves had been estimated for these same items on the assumption that all were of logistic form. Surprising agreement was found between the results obtained from the two unrelated methods. (Author)

Descriptors :   (*PSYCHOLOGICAL TESTS, STATISTICAL ANALYSIS), (*DISTRIBUTION FUNCTIONS, MATHEMATICAL PREDICTION), INTELLIGENCE TESTS, CURVE FITTING, REGRESSION ANALYSIS, STATISTICAL DISTRIBUTIONS, SAMPLING, MATHEMATICAL MODELS, PERFORMANCE(HUMAN), DISTRIBUTION THEORY, CORRELATION TECHNIQUES

Subject Categories : Psychology
      Statistics and Probability

Distribution Statement : APPROVED FOR PUBLIC RELEASE