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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