sounds like you are referring to library(effects)...in which case try: 
plot(effect("x1", model), color="red")





________________________________
 From: David Winsemius <dwinsem...@comcast.net>
To: karine heerah <karine.hee...@hotmail.fr> 
Cc: "r-help@r-project.org" <r-help@r-project.org> 
Sent: Sunday, January 12, 2014 8:35 PM
Subject: Re: [R] how to change the color of the regression line when using      
effect function



On Jan 12, 2014, at 7:26 PM, karine heerah wrote:

> Hi all,
> Do you know how to change the color of the regression line, confidence 
> interval etc. when plotting the "effect" function:
> plot(effect("explanatory varible", model.name),xlab,ylab....)
> I tried to include the "col" argument of the plot function but it didn't work.
> Thanks,Karine                           
>     [[alternative HTML version deleted]]

> 
A) You should post in plain text.

B) You should precede your code with a library() call that loads the package 
where the effect() function resides. This is especially needed when the name 
"effect" is such a ubiquitous word in statstical documentation:

> ?effect
No documentation for ‘effect’ in specified packages and libraries:
you could try ‘??effect’

Even trying ??"effect" was not very helpful.

-- 

David Winsemius
Alameda, CA, USA

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