Figure 4. Left: scatter plots of predicted age (year) and chronological age in the age estimation model after LOOCV. Right: scatter plots of predicted age (year) and chronological age for wild bears based on the methylation levels assigned to the left model. Solid line represents predicted age = actual age; distance between the dotted line and solid line represents the MAE of the model after LOOCV; single regression model (a, d), the best elastic net regression model (b, e), and the best SVR model (c, f).