Adaptive regression modeling of biomarkers of potential harm in a population of U.S. adult cigarette smokers and nonsmokers

Table 5 Summary of model fit statistics across models for all subjects

Model	Random Forest R²: Analysis Data Set	MARS GCV R²: Analysis Data Set	Linear Regression R²: Analysis Data Set	Linear Regression R²: Validation Data Set (applied)	Linear Regression R²: Validation Data Set (Refit)
WBC	0.28	0.27	0.29	0.29	0.31
EPI8	0.40	0.42	0.41	0.35	0.38
DEH11	0.28	0.28	0.29	0.25	0.27
HDL	0.40	0.37	0.39	0.40	0.41

ISSN: 1471-2288