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Psychometrika

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Blair, R. Clifford	1
Higgins, James J.	1
Molenaar, Ivo W.	1
Sijtsma, Klaas	1

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On the Relative Power of the Paired Samples t Test and Wilcoxon's Signed-Ranks Test.

Blair, R. Clifford; Higgins, James J. – 1985

Monte Carlo methods were employed to assess the relative power of the paired samples t test and Wilcoxon's signed-ranks test under ten population shapes. Results of the study indicated that: (1) each of the two statistics was more powerful than the other in given situations; (2) the power advantages of the t test under normal theory were small;…

Descriptors: Estimation (Mathematics), Literature Reviews, Measurement Techniques, Monte Carlo Methods

Reliability of Test Scores in Nonparametric Item Response Theory.

Peer reviewed

Sijtsma, Klaas; Molenaar, Ivo W. – Psychometrika, 1987

Three methods for estimating reliability are studied within the context of nonparametric item response theory. Two were proposed originally by Mokken and a third is developed in this paper. Using a Monte Carlo strategy, these three estimation methods are compared with four "classical" lower bounds to reliability. (Author/JAZ)

Descriptors: Estimation (Mathematics), Latent Trait Theory, Measurement Techniques, Monte Carlo Methods