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Table 14 Top 10 important features for death1yr and PCI generated by Random Forest feature selection method (Genuer et al. 2010)

From: Referral paths in the U.S. physician network

Rank Death1yr PCI
1 Total RVU of the referral path Average time gap on the referral path
2 Total RVU of the previous referral path Indicator of patient’s age in 66-70
3 Average time gap on the referral path Average PageRank values of all physicians on the referral path
4 Time range of the referral path Indicator of the key physician’s specialty on the referral path as “interventional cardiology”
5 Average index of the first-time occurrence on a referral path for the last physician Indicator of patient’s age in 76+
6 Local clustering coefficient of the last physician on the referral path The number of referral paths that include the last physician
7 Times of being the end node on a referral path of the last physician on the referral path Indicator of the key physician’s specialty on the referral path as “interventional cardiology”
8 Times of being the first node on a referral path for the last physician Average #involved paths among physicians on the referral path
9 indicator of patient’s age in 76+ Average times of being the first node on a referral path for all physicians on the referral path
10 Average times of being the end node on a referral path for all physicians on the referral path Times of being the first node on a referral path for the last physician