Re: [R] find confounder in covariates

2005-07-22 Thread Spencer Graves
It was easier than I thought. To your example, just add one line: alias(f) Model : y ~ z1 + z2 + z3 Complete : (Intercept) z1B z1C z3 z2Bb 1 z2Cc 1 spencer graves Young Cho wrote: Hi, I was wondering if there is a way, or function

[R] find confounder in covariates

2005-07-21 Thread Young Cho
Hi, I was wondering if there is a way, or function in R to find confounders. For istance, a = sample( c(1:3), size=10,replace=T) X1 = factor( c('A','B','C')[a] ) X2 = factor( c('Aa','Bb','Cc')[a] ) Xmat = data.frame(X1,X2,rnorm(10),rnorm(10)) dimnames(Xmat)[[2]] = c('z1','z2','z3','y')