02-11-2013 08:00 AM
Does anybody know how I can constrain the correlation between two random effect to be 1?
I know about the PARMS statement (with the hold option), but with this statement I can constrain the Co-variance, but is there a direct way to constrain the correlation itself?
Thanks a lot
02-11-2013 08:16 AM
I don't know whether this will work, but it is possible to specify the covariance structure as being based on the correlations, using type=unr. From there, it seems possible that you could constrain a correlation to be a fixed value.