The cross validation error <i>CVE</i> (mean SD) for different classifiers in the <i>genetic</i> space and their subspaces obtained by using five features selection methods (<i>RLS</i>, <i>ReliefF</i>, <i>CFS-FS</i>, <i>mSVM-RFE</i>, <i>MRMR</i>) and five classifiers (<i>RF</i>, <i>KNN</i>, <i>SVM</i>, <i>NBC</i>, <i>CPL</i>), see Section “Alternative methods for feature selection and classification”.

*<p>ReliefF and MRMR are ranking procedures. The optimal sets of features for these two methods were determined for each classifier separately; the number of features (shown in parentheses) corresponds to the size of the subset of features characterized by the smallest cross validation error for the specific classifier.