Table 7.
Model-Fitting Results: Cholesky Decomposition With Months of School
| Model | −2 log likelihood | df | χ2 change | dfchange | pchange |
|---|---|---|---|---|---|
| PA/RAN/Word ID | |||||
| Full | 4,022.65 | 1688 | |||
| Genetic | |||||
| Drop GenWID (A1 to WID) | 4,044.24 | 1689 | 21.59 | 1 | <.01 |
| Drop RAN (all A2) | 4,022.65 | 1690 | 0.00 | 2 | |
| Drop RANWID (A2 to WID) | 4,022.65 | 1689 | 0.00 | 1 | |
| Drop WIDresid (A3) | 4,022.65 | 1689 | 0.00 | 1 | |
| Shared environment | |||||
| Drop GenWID (C1 to WID) | 4,038.99 | 1689 | 16.34 | 1 | <.01 |
| Drop RAN (all C2) | 4,034.45 | 1690 | 11.80 | 2 | <.01 |
| Drop RANWID (C2 to WID) | 4,022.65 | 1689 | 0.00 | 1 | |
| Drop WIDresid (C3) | 4,022.65 | 1689 | 0.00 | 1 | |
| Months of school | |||||
| Drop PA | 4,025.29 | 1689 | 2.64 | 1 | |
| Drop RAN | 4,024.66 | 1689 | 2.01 | 1 | |
| Drop WID | 4,064.97 | 1689 | 42.32 | 1 | <.01 |
| PA/RAN/PD | |||||
| Full | 4,040.61 | 1692 | |||
| Genetic | |||||
| Drop GenPD (A1 to PD) | 4,071.87 | 1694 | 31.26 | 1 | <.01 |
| Drop RAN (all A2) | 4,040.61 | 1693 | 0.00 | 2 | |
| Drop RANPD (A2 to PD) | 4,040.61 | 1693 | 0.00 | 1 | |
| Drop PDresid (A3) | 4,040.61 | 1693 | 0.00 | 1 | |
| Shared environment | |||||
| Drop GenPD (C1 to PD) | 4,049.21 | 1694 | 8.60 | 1 | <.01 |
| Drop RAN (all C2) | 4,052.19 | 1693 | 11.58 | 2 | <.01 |
| Drop RANPD (C2 to PD) | 4,040.61 | 1693 | 0.00 | 1 | |
| Drop PDresid (C3) | 4,042.18 | 1693 | 1.57 | 1 | |
| Months of school | |||||
| Drop PA | 4,042.91 | 1693 | 2.30 | 1 | |
| Drop RAN | 4,043.00 | 1693 | 2.39 | 1 | |
| Drop WID | 4,072.09 | 1693 | 31.48 | 1 | <.01 |
Note. Submodels were not run for nonshared environment because none of the bivariate relationships presented in Tables 4 and 5 was significant. A1, A2, A3, C1, C2, C3, and months of school refer to factors/variables displayed in Figure 2. PA = phonological awareness; RAN = rapid automatized naming; Word ID (or WID) = word identification; Gen = genetic; PD = phonological decoding; resid = residual.