Table 4.
Model Selection for Entire Sample and Each Outcome Group. Low PR indicates a poor fit to the model.
| Linear Model |
Quadratic Model |
Cubic Model | Quartic Model | ||
|---|---|---|---|---|---|
| Entire Sample | GFI Chi-Square Chi-Square DF PR>Chi-Square |
.50 136.26 33 <.0001 |
.77 60.73 30 .0008 |
.80 49.37 26 .0037 |
.89 36.6 21 .0187 |
| Low Vocabulary Outcome Group |
GFI Chi-Square Chi-Square DF PR>Chi-Square |
.66 43.01 33 .11 |
.69 38.83 30 .13 |
- - - - |
- - - - |
| High Vocabulary Outcome Group |
GFI Chi-Square Chi-Square DF PR>Chi-Square |
.50 76.87 33 <.0001 |
.74 39.58 30 .11 |
.76 35.45 26 .1 |
.81 28.74 21 .12 |