Abstract
Abstract Sex differences are common in the behavioral sciences. In addition to modelling mean, prevalence and variance differences, behavioral genetic sex‐limitation models can identify the presence of both quantitative and qualitative sex differences. Quantitative sex differences refer to the fact that the proportion of variance due to genes, shared, and nonshared environment may differ between the sexes. Qualitative sex differences indicate whether the same or different genes or shared environment influence the two sexes. Models are described that test for both quantitative and qualitative sex differences in variation in the normal range, underlying liability of risk to disorder, and presence of an extreme group at one end of a distribution.
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