Re: [R] calculate residue by groups

Hi, Works for me: samp$Resid <- as.numeric(do.call("c",by(samp, samp$Race, function(x)resid(lm(stroke~Sex+Age, data=x) On 24/10/2007, Jiong Zhang, PhD <[EMAIL PROTECTED]> wrote: > > Hi Folks, > > I want to get the regression residue which each Race. But using: > sample$resid <- by(sample,sa

[R] calculate residue by groups

Hi Folks, I want to get the regression residue which each Race. But using: sample$resid <- by(sample,sample$Race),function(x)resid(lm( stroke ~ Sex + Age + Smoker + BMI, data = x))) Does not work. How do I calculate residue by grops? thanks. jiong The email message (and any attachments) is for