R help - Apr 2013 - Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]) :

i  am  getting  the   following  error

Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]) :
  contrasts can be applied only to factors with 2 or more levels

can  any  on e suggest  how  to    rectify

	[[alternative HTML version deleted]]

You didn't show an example of how to recreate your problem, but
this shows up when a term in a model is a factor (or character) variable
with no variation in it.  E.g.,
  > d <- data.frame(y=1:10, x1=rep(3,10),
x2=rep(c("Female","Male"),c(7,3)))
  > lm(y ~ x1 + x2, data=d, subset = x2=="Female")
  Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]) : 
    contrasts can be applied only to factors with 2 or more levels
You have to look through the dataset to see which column is the offender.

Numeric columns with no variation are accepted; this is just a problem with
character/factor columns:
  > lm(y ~ x1 + x2, data=d)
  
  Call:
  lm(formula = y ~ x1 + x2, data = d)
  
  Coefficients:
  (Intercept)           x1       x2Male  
            4           NA            5  

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at
r-project.org] On Behalf
> Of sgs sys
> Sent: Saturday, April 27, 2013 7:59 AM
> To: r-help at r-project.org
> Subject: [R] Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 +
isOF[nn]]) :
> 
> i  am  getting  the   following  error
> 
> Error in `contrasts<-`(`*tmp*`, value = contr.funs[1 + isOF[nn]]) :
>   contrasts can be applied only to factors with 2 or more levels
> 
> can  any  on e suggest  how  to    rectify
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> 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.