Minimum Dimension of K MatrixUse this field to specify the minimum dimension of the K matrix to test for finding the optimal compression level of K . The value entered in this field must be a numeric positive integer.If this field is left blank , a minimum dimension of 1 is used and compression is done until all samples form one cluster, which would produce the GLM model fit with no random effect .
Make sure that the Optimized compression method is specified OR the Compress the K matrix box is checked (whichever is available).