Figure 3

Clinical variables were selected using the LASSO logistic regression model alongside the rib fracture Grade I–III scoring system (A and B) and “undisplaced”, “offset”, and “displaced” nomenclature (C and D). (A) Shrinkage of coefficients by hyperparameter (λ). (B) Hyperparameter selection (λ) using cross-validation. The dotted line indicates the value of the harmonic log (λ) when the model error is minimized. In the LASSO logistic regression model, five variables were selected when log (λ) was -2.6902. (C) Shrinkage of coefficients by hyperparameter (λ). (D) Hyperparameter selection (λ) using cross-validation. The dotted line indicates the value of the harmonic log (λ) when the model error is minimized. In the LASSO logistic regression model, five variables were selected when log (λ) was -2.7832.