Accession Number : ADA313823

Title :   Missing Responses and IRT Ability Estimation: Omits, Choice, Time Limits, and Adaptive Testing.

Descriptive Note : Final rept.,

Corporate Author : EDUCATIONAL TESTING SERVICE PRINCETON NJ

Personal Author(s) : Misley, Robert J. ; Wu, Pao-Kuei

PDF Url : ADA313823

Report Date : JUN 1996

Pagination or Media Count : 54

Abstract : The basic equations of item response theory (IRT) provide a foundation for inferring examinees' abilities from responses to different test items. In practice, examinees do not generally provide a response to all items--for reasons that may or may not have been intended by the test administrator, and that may or may not be related to their ability. The mechanisms that produce missingness must be taken into account if correct inferences are to be drawn. Using concepts introduced by Rubin (1976), we discuss the implications for Bayesian and direct likelihood ability parameter estimation that are entailed by alternate test forms, targeted testing, adaptive testing, time limits, omitted responses, and examinee choice of tasks. Attention is focused on whether, in each case, the mechanism for missingness is 'ignorable,' and, in those cases in which it is not, how it can be modeled.

Descriptors :   *STATISTICAL INFERENCE, *REACTION(PSYCHOLOGY), MATHEMATICAL MODELS, SKILLS, PERFORMANCE(HUMAN), MAXIMUM LIKELIHOOD ESTIMATION, PROBABILITY DISTRIBUTION FUNCTIONS, STATISTICAL SAMPLES, BAYES THEOREM, JUDGEMENT(PSYCHOLOGY), PSYCHOMETRICS, PERCEPTION(PSYCHOLOGY), INTELLIGENCE TESTS.

Subject Categories : Psychology
      Statistics and Probability

Distribution Statement : APPROVED FOR PUBLIC RELEASE