We first examined descriptive statistics and inter-correlations between key study variables. We then conducted a series of path models, separately for fathers and mothers, to test our hypotheses related to genetic and socio-environmental influences on educational attainment. Specifically, we started by conducting path models to test for the presence of social genetic effects on offspring educational attainment. In these models (see Figure 1), parental education polygenic score was specified as an exogenous variable predicting offspring educational attainment and offspring education polygenic score. Offspring education polygenic score was also specified to predict offspring educational attainment. If parental education polygenic score is associated with offspring educational attainment above and beyond the effect of offspring education polygenic score, that would provide evidence that there are social genetic effects on educational attainment.
