Constraining variance components
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Constraining variance components

I want to estimate the genetic correlation between two traits measured on 
different animals in different years (essentially the same structure as one 
trait measured only on males and another measured only on females).  I have 
different number of observations per 'trait'.

What is the best way to handle this?
I get the error "Failed to parse R structure line" with trying to constrain 
the residual covariance to zero.

Thanks in advance,
Bruce Southey

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