Can you provide a small example data set?
Does the number after the X and Y indicate the subject?
Are you trying to come up with a single line of code to do this ... ?
     lm(Y1 ~ X1, data=DF)
     lm(Y2 ~ X2, data=DF)
     ...
     lm(Y5 ~ X5, data=DF)

Jean


"R Heberto Ghezzo, Dr" <heberto.ghezzo@mcgill.ca> wrote on 07/31/2012 
03:33:40 PM:
> 
> Hello, I have a data frame with the following variables:
>  ID, X1,X2,X3,X4,X5,Y1,Y2,Y3,Y4,Y5 and some other that do not 
> matter, some of the X and Y can be missing (NA). I want to compute 
> the slope of the linear regression Y ~ X for each subject, so using
>  apply(DF,1,FUN,ra.rm=TRUE) now How do I define FUN? The X are 
> different for each subject.
> Thanks for any help
> 
> R.Heberto Ghezzo Ph.D.
> Montreal - Canada

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