Re: [R] error in summary.Design

From: Frank E Harrell Jr <f.harrell_at_vanderbilt.edu>
Date: Mon, 28 Apr 2008 11:25:13 -0500

DAVID ARTETA GARCIA wrote:
> Dear list,
>
> after fitting an lrm with the Design package (stored as "mymodel") I try
> running a summary, but I get the following error:
>
> dim(mydata)
> [1] 235 9
>
> names(mydata)
> [1] "id" "VAR1" "VAR2" "VAR3" "VAR4" "VAR5" "VAR6" "VAR7" "VAR8"

>
> summary(mymodel)

What is mymodel? Please read the posting guide by providing a full reproducible example. You can't expect people to help if you want to keep your code a secret.

> Error in `contrasts<-`(`*tmp*`, value = "contr.treatment") :
> contrasts can be applied only to factors with 2 or more levels
>
> but,
>
> VAR1 is my dependent
>> nlevels(factor(VAR1))
> [1] 2

This does not tell you about VAR1. It tells you about VAR1 after converting it to a factor variable.

Frank

>
> VAR2 is continuous

>> summary(psa)

> Min. 1st Qu. Median Mean 3rd Qu. Max.
> 0.90 6.05 8.40 10.99 13.15 59.70
>
> and for the remaining variables...
>
>> nlevels(factor(VAR3))

> [1] 2
>> nlevels(factor(VAR4))

> [1] 2
>> nlevels(factor(VAR5))

> [1] 3
>> nlevels(factor(VAR6))

> [1] 2
>> nlevels(factor(VAR7))

> [1] 2
>> nlevels(factor(VAR8))

> [1] 2
>
>
> What I am missing?
>
> Thanks in advance,
>
> David
>
> ______________________________________________
> R-help_at_r-project.org mailing list
> 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.
>
-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University

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Received on Mon 28 Apr 2008 - 17:37:01 GMT

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