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| | IOMW9 Rasch Measurement Abstracts, 1997 |
 | | Optimal Categorization of a Rating Scale: A Longitudinal Study (AERA 26.42) |
 | | Weimo Zhu, Wayne State U.; Wynn Updyke, and Cheryl Lewandowski, Indiana U. To determine its stability of optimal categorization, a 50-item psychomotor self-efficacy scale was administered four times to a total of 2,022 children from 15 Midwestern schools during a four-year period. |
 | | By combining adjacent categories in a "collapsing" process, in which new categorizations are constructed, the optimal categorization was determined by comparing indexes of Person and Item Separation and fit statistics provided by the Rasch analysis. |
| www.rasch.org /rmt/rmt104d.htm (6490 words) |
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