Are there multivariate Twin scripts for pathic and/or matic scripts available to work with?
Not as far as I know. However, the advent of lower triangular matrices should make it a snap to modify UnivariateTwinAnalysis_Matrix.R to a Cholesky, and the algebras for common and independent models are very straightforward. Sex-limitation scripts will be a bit more challenging as there are several choices to be made.
OK. Made and commited a fairly expandable 2-group multi-variate script
Comments welcome. It would be good to add mx comparison checks, then add some path dropping and fit-change code.
Look forward to seeing those 5-group sex limitation models :-)