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web13805
2013 Mar 08
1
question on package plm
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