Independent Variable Importance

Figure 1. Independent variable importance chart
Independent variable importance chart

The importance chart shows that the results are dominated by the surgical procedure performed, followed by whether complications were encountered, followed distantly by other predictors. The importance of the surgical procedure is clearly visible in the plots for Treatment costs and is somewhat less visible for Length of stay, although the effect of complications on Length of stay appears to be visible in the patients with the largest observed lengths of stay.

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