Table 5.

The related importance of variables.

Variable	The variable weight of RF	The variable weight of Lasso
Length of stay	0.730	0.605
Major procedure	0.089	0
Number of other diagnosis	0.067	−0.019
Age	0.050	−0.013
Medical payment method	0.031	0.018
Hospitalization frequency	0.015	0
Gender	0.007	−0.005
Number of procedure	0.006	0
Marital status	0.005	0