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. Author manuscript; available in PMC: 2024 Jul 1.
Published in final edited form as: Intelligence. 2023 May 5;99:101759. doi: 10.1016/j.intell.2023.101759

Table 3.

Model fit results for word list

Model Description -2LL Parameters Δ−2LL Δdf p AIC BIC
1 ACE −33947.66 39 - - 67973.33 68265.98
2 AE −33949.67 36 2.01 3 0.570 67971.35 68241.49
3 AE (Quadratic effects removed) −33953.79 34 4.11 2 0.128 67975.57 68230.70
4 AE (Linear effects removed) −39331.87 32 5378.08 2 0.000 78727.74 78967.86

Notes. A = additive genetic variance; C = shared environmental variance; E = nonshared environmental variance; −2LL = −2 log likelihood; Δ−2LL = difference in −2LL between models being compared; Δdf = difference in degrees of freedom between models being compared; p = probability; AIC = Akaike Information Criterion; BIC = Bayesian Information Criterion