Full model |
 Model | -2LL | Parameters | df | AIC | BIC | Δχ
2
| Δdf |
p
|
 Saturated | 25,044.31 | 70 | 9494 | 6056.31 | −49,743.70 | – | – | – |
 ADEs | 25,155.82 | 28 | 9536 | 6083.82 | −49,963.04 | 111.51 | 42 | <.001 |
Nested models |
 Model | -2LL | Parameters | df | AIC | BIC | Δχ
2
| Δdf |
p
|
 ADE scalar | 25,160.31 | 25 | 9539 | 6082.31 | −49,982.19 | 4.84 | 3 | .21 |
 ADE hom. | 25,220.50 | 15 | 9549 | 6122.50 | −50,000.77 | 64.68 | 13 | <.001 |
 AE scalar | 25,165.81 | 20 | 9544 | 6077.81 | −50,016.07 | 9.99 | 8 | .27 |
 AE scalar | 25,208.87 | 14 | 9550 | 6108.87 | −50,020.27 | 53.05 | 14 | <.001 |
 E scalar | 26,053.90 | 9 | 9555 | 6943.90 | −49,214.63 | 898.08 | 19 | <.001 |
- Statistics for the ADEs model are in comparison with the saturated model. Statistics for all other models are in comparison to the ADEs model. Saturated model: model of the observed data, allowing means and variances to differ across twin order and zygosity. All other models constrain means and variances to be equal across twin order and zygosity
-
-2LL fit statistic, which is -2*log-likelihood of the data, df degrees of freedom, AIC Akaike’s Information Criteria, BIC Bayesian Information Criteria, Δχ
2 change in -2LL between two models, distributed, χ2, Δdf change in degrees of freedom between two models, A additive genetic influence, D non-additive genetic influence, E nonshared environmental influence, s sibling interaction effects, hom. homogeneity model, which collapsed all estimates across sex
