Generated Metrics
^^^^^^^^^^^^^^^^^

- **What evaluation metrics are available for GBM?**

 - MSE
 - RMSE
 - MAE
 - RMSLE
 - Mean Residual Deviance

  **Notes**: MSE = Mean Residual Deviance for Gaussian distributions. Also, look at Mean Residual Deviance when using quantile distributions.

- **How is variable importance determined?**

 Variable importance is determined by calculating the relative influence of each variable: whether that variable was selected during splitting in the tree building process and how much the squared error (over all trees) improved (decreased) as a result.