FIGURE 3.

Accuracy and precision of age predictions using elastic net models to predict chronological age for n = 21 Pinus taeda trees (ages 1–55 years) using a leave‐one‐out‐cross‐validation approach. (a) Predicted ages were highly correlated with chronological ages (R ² = .85, obtained from a regression of predicted age with chronological age). (b) Precision of predicted ages was assessed by comparing estimated age for each individual to their chronological age and is expressed as mean absolute error (MAE) in years.