KNN classification for stress data. The classification accuracy obtained using the combined representation as a function of dimensionality. The CCA-based combination (solid line) is consistently worse than the PCA-based approach (dashed line), implying that the class labels might not correlate that well with the true shared response. As a baseline, the classification accuracy obtained by the concatenation of all original data sets (dotted line) is also included.
Tripathi et al. BMC Bioinformatics 2008 9:111 doi:10.1186/1471-2105-9-111