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Thanks Giovanni, but I already tried with the others "random.method" and it doesn't work anyway. Do you think is it possible change the if statement in the plm formula, to set the value to 0 if sigma<0...
You're right David, I'm really sorry. I deactivated html, hope now it works. > R 2.15.2 plm() function on?Windows 7. I have a problem with the variance estimation in a random effect model I used this...
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