I receive PARAMETER ESTIMATES when I use a different "yvar" from the same dataset. But when I use this similar variable in my call statement (Chgroa3), I get the above error messages and no PARAMETER ESTIMATES.
You can't take a square root of a negative number. You get a negative number from
cov = x1 + x2 - x3;
I don't think this is really a way to obtain a covariance matrix, and I have never seen anyone subtract a covariance from another covariance matrix, so I'm not really sure why you are doing this subtraction.
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