On Fri, Jul 15, 2011 at 2:05 PM, Data Analytics Corp. <w...@dataanalyticscorp.com> wrote:
> But then he apparently rescaled this 44x13 > matrix so that the rows all sum to zero and the columns all sum to zero. > None of the row and column standard deviations are 1.0. This I can't see > how to do. How can I rescale the rows and columns so that they all sum to > zero? Any suggestions? Well, he could have used the Gower's centering transformation described for example in this pdf: www.stat.auckland.ac.nz/~mja/prog/PCO_UserNotes.pdf As you can convince yourself very easily, given any matrix A, the matrix G calculated as on page 3 of the document will have zero sum rows and columns. HTH, Peter ______________________________________________ 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.
