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The Effect of the Uncertainty of Item Parameter Estimation on Ability Estimates.

Peer reviewed

Tsutakawa, Robert K.; Johnson, Jane C. – Psychometrika, 1990

The conventional method of measuring ability--based on items with assumed true parameter values obtained from a pretest--is compared to a Bayesian method that deals with the uncertainties of such items. Data from a 1987 American College Testing Program mathematics test indicate that maximum likelihood/Bayesian techniques underestimate uncertainty.…

Descriptors: Ability Identification, Bayesian Statistics, College Entrance Examinations, Comparative Analysis