Hello,
Apologies in advance if this is a stupid question. I am running R on Ubuntu
9.
R version 2.9.2 (2009-08-24)
I am trying to work with plm. I think the library is installed, as I can do
> library(plm)
Loading required package: kinship
Loading required package: survival
Loading required package: splines
Loading required package: nlme
Loading required package: lattice
[1] "kinship is loaded"
Loading required package: Formula
Loading required package: MASS
Loading required package: sandwich
Loading required package: zoo
Attaching package: 'zoo'
The following object(s) are masked from package:base :
as.Date.numeric
>
which seems reasonable. However, it fails running the included example in
the help.
> data("Produc", package="Ecdat")
> zz <- plm(log(gsp)~log(pcap)+log(pc)+log(emp)+unemp, data=Produc,
index=c("state","year"))
Error in do.call("~", list(firstpart, as.name(i))) :
object 'firstpart' not found
In addition: Warning messages:
1: In if (length(formula) == 2) formula <- expand.formula(formula) :
the condition has length > 1 and only the first element will be used
2: In if (length(formula) == 1) part = "first" :
the condition has length > 1 and only the first element will be used
3: In if (length(formula) == 2) part = "both" :
the condition has length > 1 and only the first element will be used
4: In if (length(x) == 1) { :
the condition has length > 1 and only the first element will be used
5: In if (length(x) == 2) { :
the condition has length > 1 and only the first element will be used
At first I thought it was my code that was causing the error, but if it is
failing on the example from the ?plm page, then I figured I should start
there. Any suggestions?
Thank you,
-stephen
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