For the Hessian not positive definite message -- you might try rescaling your data values, or simplifying your model.  For the non-positive definite G matrix -- you might try simplifying the random effects. It is always a good idea to examine the output, which might give you ideas on the next steps of dealing with this type of issues. Jill ... View more

The link it to the macro documentation. Check the "P.S." to see how to get the BasePlus package which contains the %dirsAndFiles() macro.   Bart ... View more