I only gave an excerpt of the dataset in the previous post to keep it short. The full version would be (columns: sim, trt, CovParm, group, estimate) The full dataset that I created is below, which is the same ordering I get when I write out the covparms dataset when fitting a model with type=UN group=trt. The implied correlation matrix is certainly positive definite. The fact that I do not even get an iteration history makes me wonder whether the initial matrix is somehow problematic or ends me up in a situation where PROC MIXED cannot iterate (but then I wonder how that worked with the UN@CS matrix...). 1 1 UN(1,1) trt 1 0.50457 1 1 UN(2,1) trt 1 0.26385 1 1 UN(2,2) trt 1 0.50457 1 1 UN(3,1) trt 1 0.26385 1 1 UN(3,2) trt 1 0.26385 1 1 UN(3,3) trt 1 0.50457 1 1 UN(4,1) trt 1 0.26385 1 1 UN(4,2) trt 1 0.26385 1 1 UN(4,3) trt 1 0.26385 1 1 UN(4,4) trt 1 0.50457 1 1 UN(5,1) trt 1 0.26385 1 1 UN(5,2) trt 1 0.26385 1 1 UN(5,3) trt 1 0.26385 1 1 UN(5,4) trt 1 0.26385 1 1 UN(5,5) trt 1 0.50457 1 1 UN(6,1) trt 1 0.26385 1 1 UN(6,2) trt 1 0.26385 1 1 UN(6,3) trt 1 0.26385 1 1 UN(6,4) trt 1 0.26385 1 1 UN(6,5) trt 1 0.26385 1 1 UN(6,6) trt 1 0.50457 1 1 UN(7,1) trt 1 0.91469 1 1 UN(7,2) trt 1 0.47830 1 1 UN(7,3) trt 1 0.47830 1 1 UN(7,4) trt 1 0.47830 1 1 UN(7,5) trt 1 0.47830 1 1 UN(7,6) trt 1 0.47830 1 1 UN(7,7) trt 1 5.08672 1 1 UN(8,1) trt 1 0.47830 1 1 UN(8,2) trt 1 0.91469 1 1 UN(8,3) trt 1 0.47830 1 1 UN(8,4) trt 1 0.47830 1 1 UN(8,5) trt 1 0.47830 1 1 UN(8,6) trt 1 0.47830 1 1 UN(8,7) trt 1 2.65992 1 1 UN(8,8) trt 1 5.08672 1 1 UN(9,1) trt 1 0.47830 1 1 UN(9,2) trt 1 0.47830 1 1 UN(9,3) trt 1 0.91469 1 1 UN(9,4) trt 1 0.47830 1 1 UN(9,5) trt 1 0.47830 1 1 UN(9,6) trt 1 0.47830 1 1 UN(9,7) trt 1 2.65992 1 1 UN(9,8) trt 1 2.65992 1 1 UN(9,9) trt 1 5.08672 1 1 UN(10,1) trt 1 0.47830 1 1 UN(10,2) trt 1 0.47830 1 1 UN(10,3) trt 1 0.47830 1 1 UN(10,4) trt 1 0.91469 1 1 UN(10,5) trt 1 0.47830 1 1 UN(10,6) trt 1 0.47830 1 1 UN(10,7) trt 1 2.65992 1 1 UN(10,8) trt 1 2.65992 1 1 UN(10,9) trt 1 2.65992 1 1 UN(10,10) trt 1 5.08672 1 1 UN(11,1) trt 1 0.47830 1 1 UN(11,2) trt 1 0.47830 1 1 UN(11,3) trt 1 0.47830 1 1 UN(11,4) trt 1 0.47830 1 1 UN(11,5) trt 1 0.91469 1 1 UN(11,6) trt 1 0.47830 1 1 UN(11,7) trt 1 2.65992 1 1 UN(11,8) trt 1 2.65992 1 1 UN(11,9) trt 1 2.65992 1 1 UN(11,10) trt 1 2.65992 1 1 UN(11,11) trt 1 5.08672 1 1 UN(12,1) trt 1 0.47830 1 1 UN(12,2) trt 1 0.47830 1 1 UN(12,3) trt 1 0.47830 1 1 UN(12,4) trt 1 0.47830 1 1 UN(12,5) trt 1 0.47830 1 1 UN(12,6) trt 1 0.91469 1 1 UN(12,7) trt 1 2.65992 1 1 UN(12,8) trt 1 2.65992 1 1 UN(12,9) trt 1 2.65992 1 1 UN(12,10) trt 1 2.65992 1 1 UN(12,11) trt 1 2.65992 1 1 UN(12,12) trt 1 5.08672 1 0 UN(1,1) trt 0 0.43945 1 0 UN(2,1) trt 0 0.18037 1 0 UN(2,2) trt 0 0.43945 1 0 UN(3,1) trt 0 0.18037 1 0 UN(3,2) trt 0 0.18037 1 0 UN(3,3) trt 0 0.43945 1 0 UN(4,1) trt 0 0.18037 1 0 UN(4,2) trt 0 0.18037 1 0 UN(4,3) trt 0 0.18037 1 0 UN(4,4) trt 0 0.43945 1 0 UN(5,1) trt 0 0.18037 1 0 UN(5,2) trt 0 0.18037 1 0 UN(5,3) trt 0 0.18037 1 0 UN(5,4) trt 0 0.18037 1 0 UN(5,5) trt 0 0.43945 1 0 UN(6,1) trt 0 0.18037 1 0 UN(6,2) trt 0 0.18037 1 0 UN(6,3) trt 0 0.18037 1 0 UN(6,4) trt 0 0.18037 1 0 UN(6,5) trt 0 0.18037 1 0 UN(6,6) trt 0 0.43945 1 0 UN(7,1) trt 0 0.69679 1 0 UN(7,2) trt 0 0.28599 1 0 UN(7,3) trt 0 0.28599 1 0 UN(7,4) trt 0 0.28599 1 0 UN(7,5) trt 0 0.28599 1 0 UN(7,6) trt 0 0.28599 1 0 UN(7,7) trt 0 4.05102 1 0 UN(8,1) trt 0 0.28599 1 0 UN(8,2) trt 0 0.69679 1 0 UN(8,3) trt 0 0.28599 1 0 UN(8,4) trt 0 0.28599 1 0 UN(8,5) trt 0 0.28599 1 0 UN(8,6) trt 0 0.28599 1 0 UN(8,7) trt 0 1.66271 1 0 UN(8,8) trt 0 4.05102 1 0 UN(9,1) trt 0 0.28599 1 0 UN(9,2) trt 0 0.28599 1 0 UN(9,3) trt 0 0.69679 1 0 UN(9,4) trt 0 0.28599 1 0 UN(9,5) trt 0 0.28599 1 0 UN(9,6) trt 0 0.28599 1 0 UN(9,7) trt 0 1.66271 1 0 UN(9,8) trt 0 1.66271 1 0 UN(9,9) trt 0 4.05102 1 0 UN(10,1) trt 0 0.28599 1 0 UN(10,2) trt 0 0.28599 1 0 UN(10,3) trt 0 0.28599 1 0 UN(10,4) trt 0 0.69679 1 0 UN(10,5) trt 0 0.28599 1 0 UN(10,6) trt 0 0.28599 1 0 UN(10,7) trt 0 1.66271 1 0 UN(10,8) trt 0 1.66271 1 0 UN(10,9) trt 0 1.66271 1 0 UN(10,10) trt 0 4.05102 1 0 UN(11,1) trt 0 0.28599 1 0 UN(11,2) trt 0 0.28599 1 0 UN(11,3) trt 0 0.28599 1 0 UN(11,4) trt 0 0.28599 1 0 UN(11,5) trt 0 0.69679 1 0 UN(11,6) trt 0 0.28599 1 0 UN(11,7) trt 0 1.66271 1 0 UN(11,8) trt 0 1.66271 1 0 UN(11,9) trt 0 1.66271 1 0 UN(11,10) trt 0 1.66271 1 0 UN(11,11) trt 0 4.05102 1 0 UN(12,1) trt 0 0.28599 1 0 UN(12,2) trt 0 0.28599 1 0 UN(12,3) trt 0 0.28599 1 0 UN(12,4) trt 0 0.28599 1 0 UN(12,5) trt 0 0.28599 1 0 UN(12,6) trt 0 0.69679 1 0 UN(12,7) trt 0 1.66271 1 0 UN(12,8) trt 0 1.66271 1 0 UN(12,9) trt 0 1.66271 1 0 UN(12,10) trt 0 1.66271 1 0 UN(12,11) trt 0 1.66271 1 0 UN(12,12) trt 0 4.05102
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