Predictions, Lasso Regression, Model Averaging, Spline Regression, Crossvalidation.
it is not R² or its adjusted variant. Good Modeling Practice dictates that you: 1.Do not build one model. 2.Do not use one metric. 3.Let yourself be guided by plots and biology. A good starting selection would be: 1.RMSE → squared error penalized for number of predictors. 2.C(p) → like RMSE, but