The GMAT2test is a generated dataset based on parameters from Graduate Management
Admission Test (GMAT, Kingston et al., 1985). First two items were considered to function differently
in uniform and non-uniform way respectively. The data set represents responses of 1,000 subjects to
multiple-choice test of 20 items. Aditionally, 4 possible answers on all items were generated,
coded A, B, C, and D. The column group represents group membership, where 0 indicates reference group
and 1 indicates focal group. Groups are the same size (i.e. 500 per group).
data(GMAT2test)A GMAT2test data frame consists of 1,000 observations on the following 21 variables:
nominal items of the test coded A, B, C, and D
group membership vector, "0" reference group, "1" focal group
Correct answers are presented in GMAT2key data set.
Kingston, N., Leary, L., & Wightman, L. (1985). An exploratory study of the applicability of item response theory methods to the Graduate Management Admission Test. ETS Research Report Series, 1985(2): 1--64.
Martinkova, P., Drabinova, A., Liaw, Y. L., Sanders, E. A., McFarland, J. L., & Price, R. M. (2017). Checking equity: Why differential item functioning analysis should be a routine part of developing conceptual assessments. CBE--Life Sciences Education, 16(2), rm2, 10.1187/cbe.16-10-0307.