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Advances in Rasch Analyses in the Human Sciences by William J. Boone & John R. Staver

Advances in Rasch Analyses in the Human Sciences by William J. Boone & John R. Staver

Author:William J. Boone & John R. Staver
Language: eng
Format: epub
ISBN: 9783030434205
Publisher: Springer International Publishing


The two tests share no items or persons in common, but the items cover similar material.

Step 1. Identify pairs of items of similar content and difficulty in the two tests. Be generous about interpreting “similar” at this stage. These are the pseudo-common items.

Step 2. From the separate analyses, cross plot the difficulties of the pairs of items, with Test B on the y-axis and Test A on the x-axis. The slope of the best-fit line i.e., the line through the point at the means of the common items and through the (mean + 1 S.D.) point should have slope near 1.0. If it does, then the intercept of the line with the x-axis is the equating constant.



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