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
> 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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