Hi R users:
I am using the plm package for linear panel data analysis but encountered the
following message when I try plm function to estimate an random model with
individual effect.
data.re.ind <- plm(X.RETURN. ~ IOB + IOBS,data=E,model="random",effect =
"individual")
Error in swar(object, data, effect) : the estimated variance of the
individual effect is negative
I have tried the other estimation methods ("walhus", "amemiya", "nerlove") in
addition to method "swar" but it does not help.
I have googled for answer but I have not found the solution yet. Actually this
problem encountered by some users but still remains unsolved, I am afraid.
Would some people help in this regard?
Best regards,
Wei-han Liu
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