data(warcolak)The dataset was simulated to have a two un-correlated traits with different genetic architectures. The additive genetic, dominance genetic, and environmental (or residual) variances for both trait1 and trait2 are specified to be 0.4, 0.3, & 0.3, respectively. However, the additive genetic variance for trait2 can be further decomposed to autosomal additive genetic variance (0.3) and X-linked additive genetic variance (0.1). These variances were drawn from multivariate random normal distributions [e.g., additive effects: N ~ (0, A * Va)] with means of zero and variances equal to the product of the desired and the relatedness (or incidence) matrix. Because of this, the actual variance in random effects will vary slightly from the amount specified in the simulation.