lm, weights and ...
"hadley wickham" <h.wickham at gmail.com> writes:
lm2 <- function(...) lm(...) lm2(mpg ~ wt, data=mtcars)
Call:
lm(formula = ..1, data = ..2)
Coefficients:
(Intercept) wt
37.285 -5.344
lm2(mpg ~ wt, weights=cyl, data=mtcars)
Error in eval(expr, envir, enclos) : ..2 used in an incorrect context, no ... to look in Can anyone explain why this is happening? (Obviously this is a manufactured example, but it crops up in ggplot when you want to provide a function to perform smoothing)
Presumably this is due to the nonstandard evaluation of the weights argument. This is a long story, the short version is that the argument ought to have been designed to be a model formula, but we haven't been willing to sacrifice S-PLUS compatibility. A more extensive white-paper on the issues, written by Thomas Lumley, is at http://developer.r-project.org/nonstandard-eval.pdf
O__ ---- Peter Dalgaard ?ster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907