Item Parameters Invariant with Changes in Group Variance
- Author(s):
- Gulliksen, Harold O.
- Publication Year:
- 1950
- Report Number:
- RB-50-50
- Source:
- ETS Research Bulletin
- Document Type:
- Report
- Page Count:
- 10
- Subject/Key Words:
- Equations (Mathematics), Item Analysis
Abstract
Formulas are derived for indexes of item difficulty that are invariant with respect to explicit selection.
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- http://dx.doi.org/10.1002/j.2333-8504.1950.tb00675.x