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(a) Confusion matrix for the L2 penalized logistic regression model. (b) Receiver-operating characteristic (ROC) curve for predicting the comorbidity of insomnia based on the optimal predictive model developed using the L2 penalized logistic regression model. Area under the curve (AUC) for comorbid insomnia is 0.76. (c) Relationship between accuracy and the amount of training data in the L2 penalized logistic regression model.
