Figure 9

Univariate regression model fitting between response variables, divergence rate (dS, dN and ω) and predictor variables, codon usage indices (GC3, GC3s, GC12, ENc) of training datasets; (A–D): average synonymous divergence (adS) rate vs codon usage indices; (E–H): average nonsynonymous divergence rate (adN) vs codon usage indices; (I–L): omega ratio (ω) vs codon usage indices; Green: Linear Model (LM), Blue: Polynomial Model (PM), Red: Generalized Additive Model (GAM), light colour represent the 95% confidence interval; R-sq (R2): Coefficient of determination; AIC: Akaike information criterion; deg: degree, edf: effective degrees of freedom.