. Author manuscript; available in PMC: 2012 Jan 24.

Published in final edited form as: J Polit. 2010;72(4):1189–1198. doi: 10.1017/S0022381610000617

Table A3.

Quantitative Disequilibrium Transmission Test of a Direct Association Between DRD4 and Number of Friends

	Estimate (standard error)	p-value
Intercept	9.21 (1.09)	0.00
Between-family component of DRD4-7R (b)	-0.23 (0.17)	0.16
Within-family component of DRD4-7R (w)	0.16 (0.33)	0.63
Age	-0.20 (0.05)	0.00
Male	-0.39 (0.17)	0.02
Deviance	25125.3
N	1941

Note: This table can be read like an ordinary regression except that the variable coding for DRD4 is divided into two variables to control for population stratification. The between-family component represents the average number of DRD4-7R alleles among all observed members of the subject’s family, while the within-family component indicates the excess number of DRD4-7R alleles relative to the family average. The results show that DRD4-7R is not directly associated with the number of friends. Null deviance = 25455.3.