IRT Model | CAT to Full-Scale θCorrelation | Mean Standard Error | ||||||
---|---|---|---|---|---|---|---|---|
1PL | 2PL | 1PL | 2PL | |||||
DIF Size | 0.42 | 0.63 | 0.42 | 0.63 | 0.42 | 0.63 | 0.42 | 0.63 |
Diff. Mean  θ = 0 |  |  |  |  |  |  |  |  |
DIF % = 10 | 0.97 | 0.97 | 0.97 | 0.97 | 0.26 | 0.26 | 0.23 | 0.24 |
DIF % = 30 | 0.97 | 0.96 | 0.97 | 0.97 | 0.26 | 0.26 | 0.24 | 0.24 |
Diff. Mean  θ = 1 |  |  |  |  |  |  |  |  |
DIF % = 10 | 0.97 | 0.97 | 0.97 | 0.97 | 0.26 | 0.26 | 0.24 | 0.24 |
DIF % = 30 | 0.97 | 0.96 | 0.97 | 0.97 | 0.26 | 0.26 | 0.24 | 0.24 |
Average | 0.97 | 0.97 | 0.97 | 0.97 | 0.26 | 0.26 | 0.24 | 0.24 |