Table A1.
G-squared | Degrees of Freedom | |||||
---|---|---|---|---|---|---|
Wave 1 | ||||||
# classes | Model 1 | Model 2 | Difference | Model 1 | Model 2 | Difference |
2 | 40523 | 41784 | 1260 | 1769381 | 1769425 | 44 |
3 | 39808 | 40757 | 950 | 1769335 | 1769401 | 66 |
4 | 39272 | 40196 | 924 | 1769289 | 1769377 | 88 |
5 | 38853 | 39736 | 884 | 1769243 | 1769353 | 110 |
6 | 38494 | 39312 | 818 | 1769197 | 1769329 | 132 |
7 | 38194 | 39033 | 839 | 1769151 | 1769305 | 154 |
Wave 3 | ||||||
# classes | Model 1 | Model 2 | Difference | Model 1 | Model 2 | Difference |
2 | 27045 | 28274 | 1229 | 331697 | 331735 | 38 |
3 | 26365 | 27456 | 1091 | 331657 | 331714 | 57 |
4 | 25957 | 26937 | 980 | 331617 | 331693 | 76 |
5 | 25669 | 26499 | 829 | 331577 | 331672 | 95 |
6 | 25415 | 26200 | 785 | 331537 | 331651 | 114 |
7 | 25210 | 26002 | 793 | 331497 | 331630 | 133 |
Wave 4 | ||||||
# classes | Model 1 | Model 2 | Difference | Model 1 | Model 2 | Difference |
2 | 22479 | 23017 | 537 | 331697 | 331735 | 38 |
3 | 21643 | 22282 | 639 | 331657 | 331714 | 57 |
4 | 21315 | 21892 | 577 | 331617 | 331693 | 76 |
5 | 21053 | 21679 | 626 | 331577 | 331672 | 95 |
6 | 20841 | 21500 | 658 | 331537 | 331651 | 114 |
7 | 20626 | 21329 | 703 | 331497 | 331630 | 133 |
Notes: Models 1 and 2 are identical, except Model 2 includes measurement invariance for gender when Model 1 does not. Clustering is not used in either of these models, and gender is a grouping variable for both models. For all classes examined at all waves, interpretation of the G-squared statistic (as a chi-square value given the degrees of freedom) indicates a significant difference (p<.01), demonstrating improved model fit for measurement invariance compared to just using gender as a group.