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Psychometrika

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Mislevy, Robert J.	1
Ten Berge, Jos M. F.	1
Verhelst, Norman	1

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Reports - Research	1

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Some Clarifications of the TUCKALS2 Algorithm Applied to the IDIOSCAL Problem.

Peer reviewed

Ten Berge, Jos M. F.; And Others – Psychometrika, 1994

The suggestion that the IDIOSCAL model be fitted by the TUCKALS2 algorithm for three-way components analysis is examined. The claim that resulting coordinate matrices will be identical is supported when the data matrices are semidefinite. Counterexamples for indefinite matrices are also constructed. (SLD)

Descriptors: Algorithms, Correlation, Equations (Mathematics), Goodness of Fit

Modeling Item Responses When Different Subjects Employ Different Solution Strategies.

Peer reviewed

Mislevy, Robert J.; Verhelst, Norman – Psychometrika, 1990

A model is presented for item responses when different subjects use different strategies, but only responses--not choice of strategy--can be observed. Substantive theory is used to differentiate the likelihoods of response vectors under a fixed set of strategies, and response probabilities are modeled via item parameters for each strategy. (TJH)

Descriptors: Algorithms, Guessing (Tests), Item Response Theory, Mathematical Models