R help - Apr 2012 - R error message

Hi,

I'm trying to do an exploratory factor analysis for a uni assignment  
but I keep getting this error message coming up

[1] "One of your variables is a constant. Constants are disallowed as  
part of a scale."

when I turn the data into a matrix and look at the stats. I've been  
told that this means one of the variables doesn't vary much any more,  
but I am really stuck on how to sort this out. The code I have used is
> summary(prefdata)
> prefdata[prefdata>5]=NA
> summary(prefdata)
> prefdata2=as.matrix(prefdata[3:22])
> stats=paf(prefdata2)
[1] "One of your variables is a constant. Constants are disallowed as  
part of a scale."

Any help would be greatly appreciated, a few of us are stuck with this  
and we're going out of our minds trying to figure out how to fix it!

Thank you so much,

Harriet & the MSc students at Edinburgh






-- 
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.

Hi,
> The code I have used is
>
>> summary(prefdata)
>> prefdata[prefdata>5]=NA
>> summary(prefdata)
>> prefdata2=as.matrix(prefdata[3:22])
>> stats=paf(prefdata2)
> [1] "One of your variables is a constant. Constants are disallowed as
> part of
could you provide some data / sample data you used for prefdata and code
that is fully reproducible?

Regards!