Try ?df to see what you did wrong!
Always use conflicts() before posting to see what you have overridden.
R normally allows you to get away with masking objects, but in this case it is the R object that is masking yours.
On Sun, 26 Dec 2004, Klaus Thul wrote:
am I doing something wrong, or is this a bug (R 2.0.1 & 1.9.1, linux&windows):
> library(MASS) > df <- data.frame(x = rnorm(100), y = rnorm(100), z = rnorm(100)) > f <- lm(x ~ y + z, data = df) > stepAIC(f, scope = list(upper = ~y * z, lower = ~1)) Start: AIC= -16.56 x ~ y + z Error in eval(expr, envir, enclos) : invalid second argument
-- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
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