Mean squared prediction error (MSE) among regularization multiplier values for each modeling regions’ final golden eagle nesting area model.

The lowest MSE value is italicized and has gray shading. For the Southwestern Plains, Southwestern Deserts, and California Foothills modeling regions, the lowest MSE was found at regularization values of 5 (the largest value we initially evaluated), so we evaluated two larger regularization multiplier values (6 and 7) to determine whether MSE continued to decline with increasing regularization.