Figure 2.

Risk predictors selection using the LASSO logistic regression model. (A) Optimal predictor (lambda) selection in the LASSO model with fivefold cross validation by minimum criteria. The area under the receiver operation characteristic curve was plotted versus log (lambda). Dotted vertical lines were drawn at the optimal values by using the minimum criteria and the 1 SE of the minimum criteria; (B) LASSO coefficient profiles of the 15 predictors. A coefficient profile plot was developed against the log (lambda) sequence. Vertical line was drawn at the value selected with fivefold cross validation, where optimal lambda resulted in 5 predictors with nonzero coefficients (lambda = 0.003).