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Download full textWingersky, Marilyn S. – 1992
The computer program LOGIST (Wingersky, Patrick, and Lord, 1988) estimates the item parameters and the examinee's abilities for Birnbaum's three-parameter logistic item response theory model using Newton's method for solving the joint maximum likelihood equations. In 1989, Martha Stocking discovered a problem with this procedure in that when the…
Descriptors: Ability, Computer Software Development, Estimation (Mathematics), Item Response Theory
Lord, Frederic M.; Pashley, Peter J. – 1988
A large sample method for obtaining asymptotic simultaneous confidence bands for a three-parameter logistic response curve is described. Simultaneous confidence bands indicate the sampling variation of item response curves relative to a fitted function. A procedure is given which requires as input maximum likelihood parameter estimates and an…
Descriptors: Computer Software Development, Goodness of Fit, Item Response Theory, Maximum Likelihood Statistics
