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. Author manuscript; available in PMC: 2010 Feb 1.
Published in final edited form as: Drug Alcohol Depend. 2008 Nov 12;100(1-2):1–8. doi: 10.1016/j.drugalcdep.2008.08.014

Table 1.

Model fitting results for the gene-environment correlation and moderation model and nested models.

-2LL d.f. A.I.C. Δχ2 Δd.f. p
Full model 8157.337 4611 -1064.663 - - -
Drop βaC 8158.189 4612 -1065.811 0.852 1 0.356
Drop βaU 8163.715 4612 -1060.285 6.378 1 0.012
Drop βcC 8158.848 4612 -1065.152 1.511 1 0.219
Drop βcU 8161.927 4612 -1062.073 4.590 1 0.032
Drop βeC 8158.512 4612 -1065.488 1.176 1 0.287
Drop βeU 8322.088 4612 -901.912 164.752 1 0.000
Best-fitting* 8160.716 4614 -1067.284 3.380 3 0.337

-2LL: minus twice the log likelihood fit of the model; d.f.: degrees of freedom; A.I.C.: Akaike information criterion (calculated as -2LL minus 2d.f.); Δχ2: the chi-square difference between the full and nested models; p: probability

*

Best fitting model is one which βaC, βcC, and βeC have all been dropped