Binare optionen mit bankeinlagen18 comments
We therefore could not estimate the variance component. This usually happens when one (or more) of the variance components are negative or constrained at zero. It might also indicate there is something wrong with the GRM or the data which you might need to check carefully. Tricks such as adding a small number of to the diagonal elements of V also do not guarantee the modified V being invertible.
In some cases, you might be able to get around the problem by using alternative REML algorithms e.