Figure 4

Bias, variance, and RMS for several CoD estimators versus sample size (n = 20, 30, 40, 50, and 60) under a Zipf model with , for actual CoD = 0.6 and varying number of bins. Plot key: resubstitution (red), leave-one-out (blue), 0.632 bootstrap (green), 10-repeated 2-fold cross-validation (black). The curves for resubstitution and leave-one-out are exact; the curves for the other CoD estimators are approximations based on Monte Carlo sampling.