Fig 3. Correct classification rate (%) and kappa (mean: black line; minimum and maximum: dash red lines) of 49 RF models with different predictor sets based on the averages over 100 iterations of 10-fold cross validation for seabed hardness based on hard70 data; and the model with the maximum mean ccr and mean kappa (circle).

a) models 1–25 based on the AVI using 20 predictive variables; b) models 26–38 based on the AVI using 41 variables; c) models 39–49 based on KIAVI using 41 variables.