Hi,
I have tried to run the code as documented here:
https://openmx.ssri.psu.edu/svn/trunk/demo/UnivariateTwinAnalysis_MatrixRaw.R
Don't know why but I always get the following error message:
Error in mxModel("twinACE", mzModel, dzModel, mxAlgebra(expression = MZ.objective + :
could not find function "mxFitFunctionAlgebra"
Any idea what is wrong here? Many thanks in advance!