KR-21 for Formula Scored Tests With Omits Scored as Wrong
- Author(s):
- Boldt, Robert F.; Flaugher, Ronald L.; Linn, Robert L.; Rock, Donald A.
- Publication Year:
- 1966
- Report Number:
- RB-66-40
- Source:
- ETS Research Bulletin
- Document Type:
- Report
- Page Count:
- 10
- Subject/Key Words:
- Guessing (Tests), Kuder-Richardson Formulas, Mathematical Formulas, Scoring Formulas, Test Reliability
Abstract
An expression was derived for computing KR-21 based on formula score statistics for the special case when the number of items on the test equals the number right plus the number wrong (i.e., either there are no omits or omits are scored wrong). The effect of using means and variances based on formula scored tests in the KR-21 formula usually given in text- books was also discussed.
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- http://dx.doi.org/10.1002/j.2333-8504.1966.tb00538.x