Chunk #5 — Methods — Subjects

Source

Modeling the genetic and environmental association between peer group deviance and cannabis use in male twins.

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Due to the sparseness in the cannabis use data at earlier ages, we limited our analyses to data between 15 and 25 years. In order to correct for skew, both the CU and the latent factor PGD scores at each time period were recoded onto three and five point ordinal scales respectively.