Second, these common factors are influenced by genetic and environmental parameters, which are parameterized as a trivariate Cholesky decomposition. Within this decomposition, the first genetic factor influences the common substance consumption factor at all three waves. The second genetic factor influences the common factor at waves 2 and 3 whereas the third genetic factor only influences the common factor at wave 3. If the genetic liability to the common factors is developmentally stable, we would expect all of the genetic liability to substance consumption to be captured in the first factor, with no evidence for innovation at the latter two. If liability is developmentally dynamic, we would expect to see innovation or new genetic variance in the second and third factors.
