Table 7 Pre-processing methods
Method | Formula |
|---|---|
Vector L2 normalization | \({R}_{\lambda }^{N}=\frac{{R}_{\lambda }}{\sqrt{\sum_{\lambda }{{R}_{\lambda }}^{2}}}\) |
Vector SNV normalization [56] | \({R}_{\lambda }^{N}=\frac{{R}_{\lambda }-\frac{1}{N}\sum_{\lambda }{R}_{\lambda }}{\sqrt{\frac{1}{N-1}\sum_{\lambda }{\left({R}_{\lambda }-\frac{1}{N}\sum_{\lambda }{R}_{\lambda }\right)}^{2}}}\) |