Fig. 4: Results of RMSE value using LOOCV. The RMS values were calculated cumulatively as the number of features increased.

RMSE root mean square error, LOOCV leave-one-out cross-validation. Model 1: Ridge regression using metabolites selected by LASSO regression. Model 2: Support vector regression (SVR) using metabolites selected by LASSO regression. Model 3: Ridge regression using metabolites selected by Random Forest. Model 4: SVR using metabolites selected by Random Forest.