
well thanks anyway even just for replying, i understand the lack of
information causes no response... but if no one tells me that they need more
information how could i send. anyway here more information about the
procedure that i am applying to define the model

after reading and attaching my data;
eco1=(wwater>0)
eco2=(wgas>0)
eco3=(wgarbage>0)
eco4=(noise>0)
eco=(eco1>0|eco2>0|eco3>0|eco4>0)
inno=(researchtot>0|purtot>0)
RD=(researchtot>0)

all of the above are my dummies as you can understand
lnLP=lnQ-lnL # then i define my dependent variable

then, newdata = plm.data(ds,index=c("stno","year")) # individual and time
indexes

after that i define the followings;

dsnri3LP=plm(lnLP~lnC+lnL+lnM+lnE+eco+eco*lnE+eco*lnM+inno+inno*eco,
data=newdata,model="random")

dsnfi3LP=plm(lnLP~lnC+lnL+lnM+lnE+eco+eco*lnE+eco*lnM+inno+inno*eco,
data=newdata,model="within")
 which are working quite well

and when i define the effect=" twoways", model="within"
dsnfi3LP=plm(lnLP~lnC+lnL+lnM+lnE+eco+eco*lnE+eco*lnM+inno+inno*eco,
data=newdata,effect="twoways",model="within")
i get the following error

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



so i hope this time i could send sufficient information about the process
and the error,  sorry that i cant send my data since it is more than 60MB.

Thanks for everyone again for the possible help

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