An IERI – International Educational Research Institute Journal
 |  |  | T Contrast | C Contrast | ||
---|---|---|---|---|---|---|
DIF | Model | Effect | Estimate | SE | Estimate | SE |
No DIF Adjustment | 1PL | 2 | 1.09 | .03 | -.48 | .04 |
 | 3 | .41 | .04 | .38 | .08 | |
 |  | 4 | 2.26 | .03 | 1.60 | .04 |
 | 2PL | 2 | 1.02 | .03 | -.39 | .04 |
 |  | 3 | .47 | .04 | .37 | .08 |
 |  | 4 | 2.22 | .04 | 1.57 | .06 |
DIF Adjusted | 1PL | 2 | 1.16 | .04 | -.50 | .06 |
 | 3 | .45 | .04 | .50 | .08 | |
 |  | 4 | 2.60 | .06 | 1.84 | .08 |
 | 2PL | 2 | .58 | .04 | -.33 | .06 |
 |  | 3 | .12 | .03 | .37 | .06 |
 |  | 4 | 1.43 | .07 | 1.01 | .10 |