[R] difficulties with MuMIn model generation with coxph

[Kamil Bartoń]

Dear Sophie,

The answer is 'typo'. 'dredge' does not have an argument named 'marge.ex'.

k


Dnia 2011-10-25 12:00, r-help-request w r-project.org pisze:
> Message: 131
> Date: Mon, 24 Oct 2011 17:08:41 -0700 (PDT)
> From: sgilbert<sophielgilbert w gmail.com>
> To:r-help w r-project.org
> Subject: [R] difficulties with MuMIn model generation with coxph
> Message-ID:<1319501321733-3935078.post w n4.nabble.com>
> Content-Type: text/plain; charset=us-ascii
>
> Hi All,
>
> I'm having trouble with the automatized model generation (dredge) function
> in the MuMIn package. I'm trying to use it to automatically generate subsets
> of models from a global cox proportional hazards model, and rank them based
> on AICc. These seems like it's possible, and the Mumin documentation says
> that coxph is supported. However, when I run the code (see below), it gives
> me the following error message:
>
> Error in UseMethod("logLik") :
>    no applicable method for 'logLik' applied to an object of class "logical"
>
> ##RCode
>
> #read in the data
>
>> >data1<-read.table('MaleData500.csv', sep=',', header=T)
> survival<-Surv(data1$Wks.at.dth, data1$Died)
>
> #create the full (global) model, a coxph object
>
>> >globemodel<-coxph(survival~  edgeden + pctroad + pctcc90+ pctcc80 +
> pctcrsog +  ravine + canfrag + pctoldc,  data=data1)
>
> #evaluate all subsets of models using dredge
>
>> >exhausting<-dredge(globemodel, eval=TRUE, fixed=c("pctroad"),m.max=3,
> marge.ex=TRUE, rank="AICc")
>
> Error in UseMethod("logLik") :
>    no applicable method for 'logLik' applied to an object of class "logical"
>
>
> any suggestions would be greatly appreciated. The globemodel works on its
> own, and prints out a summary just fine. The only thing I can think of is
> that in the names of globemodel, there is an attribute called loglik, not
> logLik?
>
> Thank you,
>
> Sophie
>