hello everyone


I am currently working on an unbalanced data, and i want to test "twoways"
effect, I know that for the unbalanced data random, twoways doenst work, but
fixed twoways supposed to work, but it doesnt and when i enter the following
model i have an error which i couldnt understand why. Because the same model
and same command with the same data set works perfectly with another
computer but doesnt work with my computer. Does anyone of you have any idea,
what could be the reason for this error?

here is the basic model that i am using

newdata = plm.data(ds,index=c("stno","year"))

dsn1<-plm(lnQ~lnC+lnL+lnM+lnE+eco+RD,data=newdata,effect="twoways",model="within")

but i have this error:

Error in rep.int(c(1, numeric(n)), n - 1L) : negative length vectors
are not allowed


thank your for your help in advance

Serdal

-- 
Serdal Ozusaglam

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