Fig. 2From: Machine learning-based nomogram for 30-day mortality prediction for patients with unresectable malignant biliary obstruction after ERCP with metal stent: a retrospective observational cohort studyLASSO regression variable screening (A) The variation characteristics of the coefficient of variables; B the selection process of the optimum value of the parameter λ in the LASSO regression model by cross-validationBack to article page