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Table 2 Classification results according to SVM, PLS-DA and CART for discrimination of fascicular tissue of the median nerve from the surrounding tissues validation data collected in the forearm area) when training the various methods using data collected in the neck area

From: Nerve detection with optical spectroscopy for regional anesthesia procedures

Classification method Feature selection MCC ACC SENS (%) SPEC (%) PPV NPV TP FN FP TN
SVM Fit 0.683 0.848 85.0 84.6 0.765 0.906 91 16 28 154
SVM PCA 0.693 0.855 83.2 86.8 0.788 0.898 89 18 24 158
SVM Segments 0.717 0.862 88.8 84.6 0.772 0.928 95 12 28 154
SVM Combined 0.751 0.882 86.9 89.0 0.823 0.920 93 14 20 162
PLSDA 10PC’s 0.580 0.789 84.1 75.8 0.672 0.890 90 17 44 138
CART Fit 0.442 0.730 71.0 74.2 0.618 0.813 76 31 47 135