Note
This command is available with the Predictive Analytics Module. Click here for more information about how to activate the module.
The Relative variable importance graph plots the predictors in order of their effect on model improvement when splits are made on a predictor over the sequence of trees. The variable with the highest improvement score is set as the most important variable, and the other variables follow in order of importance. Relative variable importance standardizes the importance values for ease of interpretation. Relative importance is defined as the percent improvement with respect to the most important predictor, which has an importance of 100%.
Relative importance is calculated by dividing each variable importance score by the largest importance score of the variables, then we multiply by 100%.
Interpretation
The most important predictor variable is Thal. If the contribution of the top predictor variable, Thal, is 100%, then the next important variable, Major Vessels, has a contribution of 97.8%. This means Major Vessels is 97.8% as important as Thal in this model.
