Subsequent modeling of the shared environmental influences showed that the simplex model including both transmission and innovation terms (model 4a; χ2 (10) = 3.45, p = 0.969) fitted the data well. Dropping the shared environmental innovation terms from the model was allowed (model 4b; χ2 (5) = 0.17, p = 0.999) indicating that shared environmental innovation was not present and that one shared environmental factor influenced the CAGE.
