function d2 = data_transform_pls(data, no_factors)
SYNOPSIS
function d2 = data_transform_pls(data, no_factors)
DESCRIPTION
function d2 = data_transform_pls(data, no_factors)
PLS according to Hastie, The elements of Statistical Learning, 2001, Algorithm 3.2, p.68
Inputs
no_factors: number of variables to be calculated.