hi: I have a y vector and an x data frame. is it possible to use the
standard linear regression (lm, summary.lm) without having to construct
a formula, i.e., all x variables should be used.
x <- data.frame( rnorm(10), rnorm(10) ); # <-- well, this would
really be read from a file
y <- rnorm(10); # ok, also read from the file.
lm (y ~ x); # this is sort of what I want to do, but of course, it
is not.
thanks for any tips. regards, /iaw
x <- data.frame( x1=rnorm(10), x2=rnorm(10) ) lm(y ~., data=x) seems to be what you want. BTW, R is not C/Perl/... and ; is a separator, not a terminator. On Wed, 12 May 2004, ivo welch wrote:> > hi: I have a y vector and an x data frame. is it possible to use the > standard linear regression (lm, summary.lm) without having to construct > a formula, i.e., all x variables should be used. > > x <- data.frame( rnorm(10), rnorm(10) ); # <-- well, this would > really be read from a file > y <- rnorm(10); # ok, also read from the file. > lm (y ~ x); # this is sort of what I want to do, but of course, it > is not.-- Brian D. Ripley, ripley at stats.ox.ac.uk 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
lm(y~.,data=x) ivo welch <iaw4 <at> welch.som.yale.edu> writes: : : hi: I have a y vector and an x data frame. is it possible to use the : standard linear regression (lm, summary.lm) without having to construct : a formula, i.e., all x variables should be used. : : x <- data.frame( rnorm(10), rnorm(10) ); # <-- well, this would : really be read from a file : y <- rnorm(10); # ok, also read from the file. : lm (y ~ x); # this is sort of what I want to do, but of course, it : is not. : : thanks for any tips. regards, /iaw