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Analysis of Variance for Type I Error.
| Factor | df | F | η2 | p |
|---|---|---|---|---|
| Purification method | 2 | 77.30 | .03 | <.01 |
| Impact | 1 | 0.04 | <.01 | .83 |
| % DIF | 1 | 98.50 | .33 | <.01 |
| Sample size | 1 | 22.57 | .04 | <.01 |
| Test length | 1 | 3.10 | .01 | .08 |
| Method × Impact | 2 | 1.04 | <.01 | .36 |
| Method × % DIF | 4 | 32.84 | .22 | <.01 |
| Method × Sample size | 2 | 17.26 | .06 | <.01 |
| Method × Test length | 2 | 0.32 | <.01 | .73 |
Note. DIF = differential item functioning; df = degrees of freedom.
