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. Author manuscript; available in PMC: 2017 Nov 1.
Published in final edited form as: Behav Genet. 2016 Aug 1;46(6):735–741. doi: 10.1007/s10519-016-9801-7

Table 3.

Goodness-of-fit statistics for bivariate heterogeneity models fitted to drug abuse ascertained from medical (DAM) and criminal (DAC) records, in designs including twins, full siblings and half siblings.

model os ns ep df −2ll AIC
hom 5482904 1370726 19 5482885 1097748.2 −9868021.8
qn 5482907 1370726 26 5482881 1096939.8 −9868822.2
qlAms 5482907 1370726 29 5482878 1096890.7 −9868865.3
qlAfs 5482907 1370726 29 5482878 1096918.0 −9868838.0
qlCms 5482907 1370726 29 5482878 1096909.8 −9868846.3
qlCfs 5482907 1370726 29 5482878 1096912.7 −9868843.4

os: number of observed statistics; ns: number of pairs; ep: number of estimated parameters; df: degrees of freedom; −2ll: minus twice the log-likelihood of the data; AIC: Akaike’s Information Criterion hom: homogeneity model: no qualitative or quantitative sex differences in ACE sources of variance; qn: quantitative sex differences in ACE sources of variance; ql: qualitative and quantitative sex differences in ACE sources of variance, with either sex-specific genetic factors in males (Ams) or females (Afs), or sex-specific shared environmental factors in males (Cms) or females (Cfs)