[R] data frame as X in linear model lm() ?
ivo welch
ivowel at gmail.com
Sat Mar 25 15:59:53 CET 2006
Dear R wizards: This must have an obvious solution, but I am stumped.
I can run a linear regression giving a matrix as the independent set
of variables, but if I give a data frame (which I would like to give,
because it should tell the linear model the names of the variables), R
does not like it. An example is:
N=20; y= rnorm(N);
x.m <- (matrix( nrow=N, ncol=2 ));
x.m[,1]=rnorm(N); x.m[,2]=rnorm(N);
print(summary(lm(y ~ x.m))); # works
x.d <- as.data.frame(x.m);
names(x.d) <- c("one.rv", "two.rv"); # I would like the summary to
know my variable names!
print(summary(lm(y ~ x.d))); # fails
[please indulge my semi-colons.] how should this be done? help, as
always, appreciated.
sincerely,
/ivo welch
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