That's solved. Just a cor between X and ti values. Thank you all.
2011/12/5 zz dd <void1...@gmail.com> > Thank's Pedro Madrones, > you're right that i have removed my name of the email (because of Spam, > and datas that i can't remove on the net). > Ok, i explain a bit more : > > X is a centred matrix. > PCA summarise all variation of X into a few new variables called scores > T.These new variables are linearly weighted combinations > of the original X-variables. > The loadings P contain the weights used for each X variable and thus > reveal the influence of individual X-variables. > Is it ok ? > > That's what give the nipals function of chemometrics package. > > It's just that i don't understand how to use The T and P matrix to have > the component matrix. > > i don't need explainations how to obtain P and T.... But in how to do E = > X tp. > But maybe it's not there for this kind of questions, i am not from > chemometrics science. > > *** > Johannes E. S. > > > > > 2011/12/5 Pedro Mardones <mardone...@gmail.com> > >> 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. >> > >> > > [[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.
