Displaying 1 result from an estimated 1 matches for "svn58871".
2012 May 25
1
columnames changes behaviour of formula
Hello. precompiled R-2.15.0, svn58871, macosx 10.7.4.
I have discovered that defining column names of a dataframe can alter the
behaviour of lm():
d <- c(4,7,6,4)
x <- data.frame(cbind(0:3,5:2))
coef(lm(d~ -1 + (.)^2,data=x))
X1 X2 X1:X2
-1.77 0.83 1.25
R>
R>
OK, so far so good. But change the column names of...