Chunk #6 — Introduction

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A note on false positives and power in G × E modelling of twin data.

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family-level variable, i.e., a variable that is by definition equal for twin 1 and twin 2, such as socioeconomic status in childhood (SES) or parental educational attainment level, then a bivariate parameterization is infeasible as the moderator does not show any variation within families.