Ricerc@Sapienza

With the development of technology and the relatively higher availability of
new instrumentations, having multiblock data sets (eg, a set of samples analyzed
by different analytical techniques) is becoming more and more common
and, as a consequence, how to handle this kind of outcomes is a widely
discussed topic. In such a context, where the number of involved variables is
relatively high, selecting the most significant features is obviously relevant.
For this reason, the possibility of joining a multiblock regression method, the
sequential and orthogonalized partial least‐squares (SO‐PLS), with a variable
selection approach called covariance selection (CovSel), has been investigated.
The resulting method, sequential and orthogonalized covariance selection (SOCovSel)
is similar to SO‐PLS, but the feature reduction provided by PLS is performed
by CovSel. Finally, predictions are made by applying multiple linear
regression on the subset of selected variables. The novel approach has been
tested on different multiblock data sets both in regression and in classification
(by combination with LDA), and it has been compared with another state‐ofthe‐
art multiblock method. SO‐CovSel has demonstrated to be suitable for its
purpose: It has provided good predictions (both in regression and in classification)
and, from the interpretation point of view, it has led to a meaningful
selection of the original variables.