Faq how do I calculate scores from a PLS or PLSDA model
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Issue:
How do I calculate scores from a PLS or PLSDA model?
Possible Solutions:
Because of the unique relationship between weights and loadings in a PLS model, the calculation of scores for new data does not simply involve a projection onto the loadings, as it does with PCR or PCA (i.e., Tnew = XnewP) . Given new data,Xnew
, the scores for these new samples are instead calculated using:
Tnew = XnewW(PTW)-1
where W
is the matrix of PLS model weights and P
is the matrix of PLS model loadings.
In Matlab notation, this can be done using:
>> scores = x*W*pinv(P'*W)
where x
is the new data. Given a standard model structure from PLS_Toolbox named "model" the following defines W
and P
:
>> P = model.loads{2,1} >> W = model.wts
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