[R] error in eval

[David Carlson]

And in fact

attach(lizards)

is included on page 560. You must have left it out of your
example code. Without it, your first example would not have run
either. 

-------------------------------------
David L Carlson
Department of Anthropology
Texas A&M University
College Station, TX 77840-4352

-----Original Message-----
From: r-help-bounces at r-project.org
[mailto:r-help-bounces at r-project.org] On Behalf Of peter
dalgaard
Sent: Tuesday, November 26, 2013 8:01 AM
To: philthe1st
Cc: r-help help
Subject: Re: [R] error in eval

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.brown at 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:
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> 
> ______________________________________________
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code.

-- 
Peter Dalgaard, Professor
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com

______________________________________________
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