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Equations (Mathematics)	2
Mathematical Models	2
Monte Carlo Methods	2
Power (Statistics)	2
Statistical Distributions	2
Classroom Techniques	1
Construct Validity	1
Elementary Secondary Education	1
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Applied Psychological…	1
Educational and Psychological…	1

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Fowler, Robert L.	2
Clingman, Joy M.	1

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Using Extreme Groups Strategy When Measures Are Not Normally Distributed.

Peer reviewed

Fowler, Robert L. – Applied Psychological Measurement, 1992

A Monte Carlo simulation explored how to optimize power in the extreme groups strategy when sampling from nonnormal distributions. Results show that the optimum percent for the extreme group selection was approximately the same for all population shapes, except the extremely platykurtic (uniform) distribution. (SLD)

Descriptors: Construct Validity, Equations (Mathematics), Mathematical Models, Monte Carlo Methods

Identifying Negatively Discriminating Items When Test Scores Are Not Normally Distributed.

Peer reviewed

Fowler, Robert L.; Clingman, Joy M. – Educational and Psychological Measurement, 1992

Monte Carlo techniques are used to examine the power of the "B" statistic of R. L. Brennan (1972) to detect negatively discriminating items drawn from a variety of nonnormal population distributions. A simplified procedure is offered for conducting an item-discrimination analysis on typical classroom objective tests. (SLD)

Descriptors: Classroom Techniques, Elementary Secondary Education, Equations (Mathematics), Item Analysis