[EMAIL PROTECTED] wrote: > Hi. I have two comments on this. > > Quoting Prof Brian Ripley <[EMAIL PROTECTED]>: > > >>On Sat, 13 Aug 2005, Alan Zhao wrote: >> >> >>>When I have more variables than units, say a 195*10896 matrix which has >>>10896 variables and 195 samples. prcomp will give only 195 principal >>>components. I checked in the help, but there is no explanation that why >>>this happen. >> >>There is not even a definition of a PC in the help. Did you read the >>references? This is what they are given for! > > > I don't know if it's too simple and introductory for the OP, but I quite like > Lindsay Smith's intro to PCA. > > http://www.cs.otago.ac.nz/cosc453/student_tutorials/principal_components.pdf It is a very good tutorial. Thank you very much for your help.
Sincerely, Zheng Zhao Aug-14-2005 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
