Table 6.
Model-Fitting Results: Cholesky Decomposition
| Model | −2 log likelihood | df | χ2 change | dfchange | pchange |
|---|---|---|---|---|---|
| PA/RAN/Word ID | |||||
| Full | 3,392.34 | 1450 | |||
| Genetic | |||||
| Drop GenWID (A1 to WID) | 3,410.71 | 1451 | 18.37 | 1 | <.01 |
| Drop RAN (all A2) | 3,392.34 | 1452 | 0.00 | 2 | |
| Drop RANWID (A2 to WID) | 3,392.34 | 1451 | 0.00 | 1 | |
| Drop WIDresid (A3) | 3,392.34 | 1451 | 0.00 | 1 | |
| Shared environment | |||||
| Drop GenWID (C1 to WID) | 3,409.62 | 1451 | 17.28 | 1 | <.01 |
| Drop RAN (all C2) | 3,404.84 | 1452 | 12.50 | 2 | <.01 |
| Drop RANWID (C2 to WID) | 3,392.74 | 1451 | 0.40 | 1 | |
| Drop WIDresid (C3) | 3,392.38 | 1451 | 0.04 | 1 | |
| PA/RAN/PD | |||||
| Full | 3,397.41 | 1454 | |||
| Genetic | |||||
| Drop GenPD (A1 to PD) | 3,427.22 | 1455 | 29.81 | 1 | <.01 |
| Drop RAN (all A2) | 3,397.41 | 1456 | 0.00 | 2 | |
| Drop RANPD (A2 to PD) | 3,397.41 | 1455 | 0.00 | 1 | |
| Drop PDresid (A3) | 3,397.41 | 1455 | 0.00 | 1 | |
| Shared environment | |||||
| Drop GenPD (C1 to PD) | 3,406.36 | 1455 | 8.95 | 1 | <.01 |
| Drop RAN (all C2) | 3,408.98 | 1456 | 11.57 | 2 | <.01 |
| Drop RANPD (C2 to PD) | 3,397.77 | 1455 | 0.36 | 1 | |
| Drop PDresid (C3) | 3,399.86 | 1455 | 2.45 | 1 | |
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 refer to factors displayed in Figure 1. PA = phonological awareness; RAN = rapid automatized naming; Word ID (or WID) = word identification; Gen = genetic; PD = phonological decoding; resid = residual.