Table 2.
Random forests variable importance ranking, the CARDIA Study, Year 15, USA (variables with value for decrease in node impurity >15).
|
Variable Importance | |
|---|---|
| Decrease in Node Impuritya | |
| Physical activity | 137.419 |
| Income | 112.478 |
| Education | 88.903 |
| Age | 78.727 |
| Chronic burden – personal health problem | 77.353 |
| Fast food consumption | 66.217 |
| Chronic burden – financial strain | 57.509 |
| Beer consumption | 43.349 |
| Chronic burden serious health problem – other person | 43.275 |
| Chronic burden – job/work | 43.195 |
| Chronic burden - relationship | 43.149 |
| High blood pressure | 37.232 |
| Wine consumption | 36.257 |
| Cigarettes/day | 35.517 |
| Liquor consumption | 31.220 |
| Difficulty paying for basics | 28.406 |
| Optimism for future | 27.367 |
| Race/ethnicity | 27.261 |
| Neighborhood trust | 23.361 |
| Neighbors share values | 20.094 |
| Neighbors help each other | 19.213 |
| Control over life events | 18.070 |
| High cholesterol | 17.643 |
| Sex | 17.206 |
| Maternal high blood pressure | 16.416 |
| Neighbors get along | 16.123 |
| Close-knit neighborhood | 16.023 |
| Marijuana use | 15.458 |
| Paternal high blood pressure | 15.404 |
a
Total decrease in node impurities from splitting on the variable averaged over all trees (by Gini index).