AFAICT, your code should not be expected to run unless you have an
attach(lizards) prior to the glm() call. Either that or you need data=lizards
in the call itself.
-pd
On 26 Nov 2013, at 12:43 , philthe1st <philip.br...@bristol.ac.uk> wrote:
> Hi there, I am learning to use and understand R but have come up against a
> problem. I'm sure it is a pretty simple thing, but I can't find a solution.
> I wonder if anyone could help?
>
> I have been using the "The R Book" by Crawley and working through some of
> the examples before trying to apply them to my data.
>
> Yesterday I tried to following from page 560:
>
>> lizards<-read.table('lizards.txt',header=T,sep='\t')
>> head(lizards)
> n sun height perch time species
> 1 20 Shade High Broad Morning opalinus
> 2 13 Shade Low Broad Morning opalinus
> 3 8 Shade High Narrow Morning opalinus
> 4 6 Shade Low Narrow Morning opalinus
> 5 34 Sun High Broad Morning opalinus
> 6 31 Sun Low Broad Morning opalinus
>> model1<-glm(n~sun*height*perch*time*species,poisson)
>
> The GLM worked and I got the correct results.
>
> In the mean time I have had a play around with my data in R and installed
> package "pscl". I then then came to back to page 560 to play around with
> some variables and could not load the glm I needed. This time, using the
> exact same codes as above I received the message:
>
> Error in eval(expr, envir, enclos) : object 'n' not found
>
> Looking at other peoples questions about this problem I have tried changing
> "sep" but with no luck. Can anyone help me work out what has changed since
> yesterday and how to get the glm codes working again?
>
> Thank you in advance for any help/suggestions.
> Phil
>
>
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/error-in-eval-tp4681170.html
> Sent from the R help mailing list archive at Nabble.com.
>
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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--
Peter Dalgaard, Professor
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd....@cbs.dk Priv: pda...@gmail.com
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