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. Author manuscript; available in PMC: 2009 Oct 6.
Published in final edited form as: Behav Genet. 2008 Feb 22;38(3):301–315. doi: 10.1007/s10519-008-9193-4

Figure 1.

Figure 1

Path diagrams for several models which may or may not contain GxM. (a) Purcell’s (2002) model for testing and quantifying GxM in the presence of rGM. (b) Main effects model containing no AM-by-M or EM-by-M terms. (c) Alternative model containing main effects of M and M2 instead of AM-by-M terms. (d) Alternative model containing no multiplicative terms in M. (e) Correlated factors model for testing and quantifying GxM in the presence of rGM.

Note: All latent variables have mean 0 and variance 1. Dashed arrows pointing from a variable to a path indicate moderation of the indicated path by that variable.