Hello The solution maybe there but i need to compute it into R if someone can help me : (Previously store score vector t in score matrix T; store loading vector p in loading matrix P) that's done by nipals in chemometrics After use of nipals function you have T and P matrix
First : "Calculate the residual matrix of X. Stop if the elements of Xres are very small because no further PCA components are reasonable" : Xres= X-u.b(T) u : improved score vector b: loading vector X : a mean-centered matrix Second : Replace X with Xres and continue with step 2 (with nipals chemometrics...) for calculation of the next PCA component. If someone can help me ? Thank's a lot 2011/12/1 zz dd <void1...@gmail.com> > Hello > i need some precision about nipals in the chemometrics package in R . > > When i use nipals in chemometrics i obtain T and P matrix. > > I really don't understand what to do with these two matrix to obtain > the scores for every the component (like in spss fo example) > > Comp1 Comp2 Comp3 > quest1 0,8434 0,54333 0,3466 > quest2 0,665 0,7655 0,433 > > Thank you very much for your help > (I know that X=TP+E)... But don't understand else.... > [[alternative HTML version deleted]] ______________________________________________ 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.