One way to accomplish this is to assign a new environment to the
formula, an environment which inherits from the formula's original
environment but one that you can add things to without affecting the
original environment. Also, since you do this in a function only the
copy of the formula in the f
Hi all,
I need to loop over "lm" within a function using "weights". For example:
mydata = data.frame(y=rnorm(100, 500, 100), x= rnorm(100),
group=rep(c(0,1), 50), myweight=1/runif(100))
reg.by.wt <- function(formula, wt, by, data) {
if(missing(by)) {
summary(lm(formula=formula, data=data,
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