Research Article

A Simulation Study to Assess the Effect of the Number of Response Categories on the Power of Ordinal Logistic Regression for Differential Item Functioning Analysis in Rating Scales

Table 1

The nine different conditions for latent trait distribution in the reference and focal groups.

ConditionAbility distribution
Reference groupFocal group

1 (0, 1) (0, 1)
2Beta (1, 4)Beta (1, 4)
3Beta (0.5, 4)Beta (0.5, 4)
4 (0, 1)Beta (4, 1)
5 (0, 1)Beta (1, 4)
6 (0, 1)Beta (4, 0.5)
7 (0, 1)Beta (0.5, 4)
8Beta (4, 1)Beta (1, 4)
9Beta (4, 0.5)Beta (0.5, 4)