Reduce variates in (s)PLS-DA

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Issue #4 resolved
Kim-Anh Le Cao repo owner created an issue

Florian has highlighted some discrepancies in the PLS vs sPLS code regarding the scaling of the variates.

According to Tenehaus (p204), the regression mode does not scale the t_h and v_h. In the current mixOmics code, the sPLS scale these variates, but the PLS does not.

Florian is testing sPLS with no scaling and see if the sPLS code should be amended.

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