Table 4.
Univariate Model-Fitting Results and Fit Statistics for Intraindividual Standard Deviations of Positive and Negative Affect
| Results of model comparison |
||||||||
|---|---|---|---|---|---|---|---|---|
| Model | –2LL | AIC | Full model compared | Δχ2 | p | A | C or D | E |
| Intraindividual standard deviations of positive affect | ||||||||
| ACE | –432.08 | –1,318.08 | — | — | — | 0.30 [0.06, 0.44] | 0.00 [0.00, 0.18] | 0.70 [0.56, 0.86] |
| ADE | –434.31 | –1,320.31 | — | — | — | 0.00 [0.00, 0.39] | 0.34 [0.00, 0.48] | 0.66 [0.52, 0.83] |
| AE | –432.08 | –1,320.08 | ACE | 0.00 | 1.000 | 0.30 [0.14, 0.44] | — | 0.70 [0.56, 0.86] |
| AE | –432.08 | –1,320.08 | ADE | 2.23 | .130 | 0.30 [0.14, 0.44] | — | 0.70 [0.56, 0.86] |
| DE | –434.31 | –1,322.31 | ADE | 0.00 | 1.000 | — | 0.34 [0.17, 0.48] | 0.66 [0.52, 0.83] |
| CE | –427.04 | –1,315.04 | ACE | 5.04 | .020 | — | 0.19 [0.06, 0.31] | 0.81 [0.69, 0.94] |
| Intraindividual standard deviations of negative affect | ||||||||
| ACE | –277.17 | –1,163.17 | — | — | — | 0.50 [0.28, 0.62] | 0.00 [0.00, 0.17] | 0.50 [0.38, 0.64] |
| ADE | –279.82 | –1,165.82 | — | — | — | 0.00 [0.00, 0.57] | 0.54 [0.00, 0.65] | 0.46 [0.35, 0.60] |
| AE | –277.17 | –1,165.17 | ACE | 0.00 | 1.000 | 0.50 [0.36, 0.62] | — | 0.50 [0.38, 0.64] |
| AE | –277.17 | –1,165.17 | ADE | 2.65 | .100 | 0.50 [0.36, 0.62] | — | 0.50 [0.38, 0.64] |
| DE | –279.82 | –1,167.82 | ADE | 0.00 | 1.000 | — | 0.54 [0.40, 0.65] | 0.46 [0.35, 0.60] |
| CE | –265.79 | –1,153.79 | ACE | 11.38 | .000 | — | 0.33 [0.20, 0.44] | 0.67 [0.56, 0.80] |
Note: Values in brackets are 95% confidence intervals. The degrees of freedom for −2 log likelihood (–2LL) is 443 for the full models and 444 for the reduced models. The degrees of freedom for all chi-squared tests is 1. A = standardized additive genetic influences; C = standardized shared environmental influences; D = standardized dominant genetic influences; E = standardized nonshared environmental influences; AIC = Akaike’s information criterion. Nonsignificant p values indicate that there was no significant deterioration in model fit between the full and the reduced models. The boldface indicates the most parsimonious models for positive affect and negative affect.