
Thank you Matthieu for your helpful suggestions.
Unfortunately I still have problems.
I have tried to compile it via your suggestion.
"
this is strange... you should have the usual summary...
I have on my machine
library(urca)
test2<-ur.df(nottem, type="none", lags=1)
summary(test2)
"
When I type in "library(urca)" I receive the following.
"Error in library(urca) : 
  'urca' is not a valid package -- installed < 2.0.0?"
When I type in "installed.packages()" the ONLY package with NA entries is URCA.
 Suggests    Built
tcltk      NA                                  "2.6.2"
tools      NA                                  "2.6.2"
urca       NA                                  NA     
utils      NA                                  "2.6.2"
I have tried to kill the session and start again but to no avail.
I have installed "Package: r-cran-urca (1.1-6-1) [universe]" from the ubuntu website for use in Windows.

My R version is 2.6.2.
Thanks in advance for your help,
Leyla. 
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