Figure 4

Surveys of LOOCV error rates by MDS dimensionality, k , for each gene segment. The LOOCV error rates of predicting genotypes (or subtypes) of references sequences were measured by varying the MDS dimensionality, k, from 1 through 50 for each gene segment of (a) HIV-1 and (b) HCV nucleotide sequences. Some gene segments showing distinctively higher error rates are labelled. Regardless of sequence types, the error rates reached plateaus after k = 10, which was used in the subsequent analyses.