Dear plm Package users,
I use the plm package a lot but I have not updated it for some times.
Now I realized the following difficulty with the summary.plm function
(demonstrated with the example from the ?plm documentation).
library(plm)
data("Produc", package="Ecdat")
estimation_method<-"within"
estimation_effect<-"individual"
zz <- plm(log(gsp)~log(pcap)+log(pc)+log(emp)+unemp, data=Produc,
index=c("state","year")
, method=estimation_method
, effect=estimation_effect
)
summary(zz)
Error: object of type 'symbol' is not subsettable
But if I run
zz <- plm(log(gsp)~log(pcap)+log(pc)+log(emp)+unemp, data=Produc,
index=c("state","year")
, method="within"
, effect="individual"
)
summary(zz)
the summary function works fine.
Is it wrong (or bad practice) to define the function's parameters as I
did in the upper example? If yes, how should it be done correctly such
that the summary function works?
I am running R 2.8.1 wie plm versin 1.1-1 on a Windows XP workstation.
Thank you for your advice, Ulrich Morawetz
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