Re: [R] ANCOVA

From: John Fox <jfox_at_mcmaster.ca>
Date: Mon, 21 Apr 2008 08:50:29 -0400

Dear Brigit,

My guess is that you forgot to specify the argument family=binomial in the call to glm().

Had you included the commands that you used as well as the error that was produced, it wouldn't be necessary to guess.

I hope this helps,
 John

On Mon, 21 Apr 2008 14:23:13 +0200
 Birgit Lemcke <birgit.lemcke_at_systbot.uzh.ch> wrote:
> R version 2.6.2 PowerBook G4
>
> Hello R User,
>
> I try to perform an ANCOVA using the glm function.
> I have a dataset with continuous and categorical data (explanatory
> variables) and my response variable is also binary categorical.
>
> Fehler: NA/NaN/Inf in externem Funktionsaufruf (arg 4)
> Zusätzlich: Warning messages:
> 1: In Ops.factor(y, mu) : - nicht sinnvoll für Faktoren (makes no
> sense for factors)
> 2: In Ops.factor(eta, offset) : - nicht sinnvoll für Faktoren
> 3: In Ops.factor(y, mu) : - nicht sinnvoll für Faktoren
>
> My dataset contains NA`s but if I try to use na.exclude, I got the
> same Error message.
>
> I thought the function should use with my dataset. What am I doing
> wrong?
>
> Thanks in advance for your help.
>
> Birgit
>
>
> Birgit Lemcke
> Institut für Systematische Botanik
> Zollikerstrasse 107
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> Switzerland
> Ph: +41 (0)44 634 8351
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>
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John Fox, Professor
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
http://socserv.mcmaster.ca/jfox/

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Mon 21 Apr 2008 - 12:53:41 GMT

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