Perhaps you can try the examples given in http://www.jstatsoft.org/v18/i02 for getting a better idea about how the NIPALS algorithm works. BTW, yes,it looks like a homework question specially when your user name is "zz dd <void1...@gmail.com>" so you can't be recognized.
On Mon, Dec 5, 2011 at 9:27 AM, zz dd <void1...@gmail.com> wrote: > Thank you for your brevity you don't have to say more things to show who > you are. > Else if you don't understand what we are talking about, you shouldn't be > rude and insulting. > May be you are quite young please take time to read Nonaka and Takeuchi and > moreover Takanashi to uderstand the way to go from information to knowledge > to wisdom that's quite useful for IS / IT and should bring you a bit of > etiquette. > *I have a dream* *that one day this nation will rise up and live out the > true meaning of its creed : “We hold these truths to be self-evident : that > all men are created equal.”* > > Have a nice day. > > 2011/12/5 Jeff Newmiller <jdnew...@dcn.davis.ca.us> > >> This is not a homework help list. >> --------------------------------------------------------------------------- >> Jeff Newmiller The ..... ..... Go Live... >> DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live >> Go... >> Live: OO#.. Dead: OO#.. Playing >> Research Engineer (Solar/Batteries O.O#. #.O#. with >> /Software/Embedded Controllers) .OO#. .OO#. rocks...1k >> --------------------------------------------------------------------------- >> Sent from my phone. Please excuse my brevity. >> >> zz dd <void1...@gmail.com> wrote: >> >> >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. >> >> > > [[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. > ______________________________________________ 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.