[R] question about formula for lm

[Greg Snow]

Try:

> lm( formula( paste( Ytext, '~ Xvar' ) ), data=X)

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111
 
 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Pedro Mardones
> Sent: Thursday, June 14, 2007 1:14 PM
> To: R-help at stat.math.ethz.ch
> Subject: [R] question about formula for lm
> 
> Dear all;
> 
> Is there any way to make this to work?:
> 
> .x<-rnorm(50,10,3)
> .y<-.x+rnorm(50,0,1)
> 
> X<-data.frame(.x,.y)
> colnames(X)<-c("Xvar","Yvar")
> 
> Ytext<-"Yvar"
> 
> lm(Ytext~Xvar,data=X) # doesn't run
> 
> lm(Yvar~Xvar,data=X) # does run
> 
> The main idea is to use Ytext as input in a function, so you 
> just type "Yvar" and the model should fit....
> Also, I need to avoid the expression X$Yvar~X$Xvar
> 
> Thanks for any idea
> 
> PM
> 
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