Figure 2. Decision Tree Predicting Next-Day Suicidal Ideation (SI) Without SI-Related Predictors (N = 3126 Observations).

Feature types are marked as follows: yellow indicates previous-day observation; (2) blue indicates cumulative mean (CM); (3) orange indicates change from cumulative mean (CH); (4) red indicates maximum (max). Features from within-day observations have a dashed node border, and features from end-of-day observation have a solid node border. ED indicates emergency department.