Effects of variations in item step values on item and test information in the partial credit model
Simulated data were used to investigate systematicallythe impact of various orderings of step difficultieson the distribution of item information for the partialcredit model. It was found that the distribution ofinformation for an item was a function of (1) therange of the step difficulty values, (2) the number ofstep difficulties that were out of sequential order, and(3) the distance between the step values that were outof order. Also, by using relative efficiency comparisons,the relationship between the step estimates andthe distribution of item information was used to demonstratethe effects of various test revisions (throughthe addition and/or deletion of items with specific stepcharacteristics) on the resulting test’s precision ofmeasurement. The usefulness of item and test informationfunctions for specific measurement applicationsof the partial credit model is also discussed.
Year of publication: |
1987
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Authors: | Dodd, Barbara G. ; Koch, William R. |
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