Hello,
Could I use the xtmixed command to run a null model?
I used the pig.dta data (http://www.stata-press.com/data/r10/pig.dta) and run
xtmixed weight||id:, var
But, I was not able to converge the data:
Iteration 534: log restricted-likelihood = -1826.5158 (backed up)
numerical derivatives are approximate
I terminated the session because 534 interatins sounded a lot.
The xtmixed command works fine if I include the explanatory variable:
xtmixed weight week ||id:, var
Is there another way of running the intercept only model in Stata?
Or, did I forget to include options in xtmixed? It would be great if somebody could help me wit this.
Sincerely,
Satomi
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