Documentation for the ScoreDiff R Function MIRT
- Author(s):
- Sinharay, Sandip
- Publication Year:
- 2019
- Report Number:
- RM-19-05
- Source:
- ETS Research Memorandum
- Document Type:
- Report
- Page Count:
- 19
- Subject/Key Words:
- Likelihood Ratio Test, Score Differencing, Cheating, Testing Fraud, Wald Test, Mixed-Format Test, Item Performance, Preknowledge, Multidimensional Item Response Theory (MIRT), R (Computer Program Language)
Abstract
This research memorandum introduces documentation for ScoreDiff, which is a function written in R. The function can be used to compute three statistics that can be used to implement score differencing for mixed-format tests, that is, tests that include both dichotomous and polytomous items. The three statistics include the Wald or Z statistic, the signed likelihood ratio (SLR) statistic, and the modified SLR statistic.
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- https://www.ets.org/Media/Research/pdf/RM-19-05.pdf