nipals in the chemometrics package in R
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zz dd <void1999 at 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 <void1999 at 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....
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