[R] ANCOVA

[John Fox]

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
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> Switzerland
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> 
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--------------------------------
John Fox, Professor
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
http://socserv.mcmaster.ca/jfox/