[R] Problem with plm package

george brida george.brida at gmail.com
Wed Jan 29 18:03:56 CET 2014

Dear friends,
I have a csv data entitled GFS in the following path:
This data is attached with this mail.
When I wrote the following lines:

y=read.csv("c:\\TEG\\GFS.csv", header=FALSE, sep=";")
  purtest(y, pmax = 4, exo = "intercept", test = "hadri")

I obtained the following message:

Error in Math.factor(x) : cumsum not meaningful for factors
In addition: There were 50 or more warnings (use warnings() to see the
first 50)

where's the problem? can you please help me
Thank you in advance

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