The effects of gene by shared environment interaction, if any, would be captured in A, and the effects of gene by nonshared environment interaction, if any, would be captured in E (Purcell 2002). The magnitude of parameter estimates is likely to be dependent on the reporter. Compared to parent reports, children tend to report that their parents treat each child more differently (Wade and Kendler 2000; Achenbach et al. 1987; Simonoff et al. 1995), possibly leading to higher estimates of E and lower estimates of C.
