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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