On Nov 29, 2009, at 11:46 AM, Carl Witthoft wrote:
Hi, A recent thread provided a (working) construct for lm: lm(as.matrix(freeny[ix]) ~., freeny[-ix]) Can someone explain what is meant by the formula in that expression, that is, what does "mymatrix~." do?
It doesn't say my matrix, it says as.matrix, and that is because freeny[iz] is most probably a dataframe.
The lm function is capable of doing manova when given a matrix on the LHS of the formula:
http://www.r-project.org/doc/Rnews/Rnews_2007-2.pdf see page 2 and onward of Dalgaard's article.
Toward the end of the Details section of formula help page (easily accessed with a click from the lm help page) you will find the explanation for the "~."
I couldn't find any such example in the lm() or formula() help pages. thanks Carl ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD Heritage Laboratories West Hartford, CT ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
