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NOTE ON THE ATTENUATING EFFECT OF ZERO-VARIANCE ITEMS ON KR-20 |
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| Authors: | DAVID M. SHOEMAKER |
| Affiliation: | Oklahoma State University |
| Abstract: | Kuder-Richardson reliability formulas 20 and 21 should not be applied to tests containing items either answered correctly or incorrectly by all examinees. The extent to which KR-20 is attenuated by zero-variance items is derived. |
| Keywords: | |