[R] too many var in lm

[David Winsemius]

On Aug 17, 2011, at 10:39 AM, carol white wrote:

> Thanks for your all replies.
>
> Actually, I have more than this number of variables. I want to make  
> a selection of variables with anova and I thought that I can apply  
> anova to the object obtained by lm. The purpose is to select the  
> genes discriminting control samples from disease.
>

You need to consult a statistician with experience in this area.

-- 
David.

> Best,
>
> Carol
>
> ----- Original Message -----
> From: Eik Vettorazzi <E.Vettorazzi at uke.uni-hamburg.de>
> To: carol white <wht_crl at yahoo.com>
> Cc: "r-help at stat.math.ethz.ch" <r-help at stat.math.ethz.ch>
> Sent: Wednesday, August 17, 2011 3:39 PM
> Subject: Re: [R] too many var in lm
>
> Hi Carol,
> it might be another question if it is sensible to use 2100 regression
> parameters, but you can use . to regress one response against all  
> other
> variables in a data frame as in:
>
> lm(formula = mpg ~ ., data = mtcars)
>
> and you can even exclude specific variables using "-"
> lm(formula = mpg ~ . - wt, data = mtcars)
>
> cheers.
>
> Am 17.08.2011 15:23, schrieb carol white:
>> Hello,
>> It might be an easy question but if you have many variables to fit  
>> in the lm function, how do you take all without specifying  
>> var1+var2+...+var2100 in the terms parameter in response ~ terms?
>>
>> Cheers,
>>
>> Carol
>>
>> ______________________________________________
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>> and provide commented, minimal, self-contained, reproducible code.
>
> -- 
> Eik Vettorazzi
>
> Department of Medical Biometry and Epidemiology
> University Medical Center Hamburg-Eppendorf
>
> Martinistr. 52
> 20246 Hamburg
>
> T ++49/40/7410-58243
> F ++49/40/7410-57790
>
>
> ______________________________________________
> 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.

David Winsemius, MD
West Hartford, CT