Thank you Arthur,
It works well now.
Regarding covariances, i have respectively 10 and 20 levels for year and year of birth. Should I put at least one effect as fixed?
Concerning the correlation structure you mentioned, which could explain a mean of BV different from zero, i'm not sure to understand its origin?
Thank you
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Received on Sat Apr 10 2009 - 11:34:25 EST
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