Description Usage Value See Also

**Random Forest**: "rf". Regression and classification.
Implemented via `ranger`

.

mtry: Number of variables to consider for each split

splitrule: Splitting rule. For classification either "gini" or "extratrees". For regression either "variance" or "extratrees".

min.node.size: Minimal node size.

**XGBoost**: "xgb". eXtreme Gradient Boosting
Implemented via `xgboost`

. Note that XGB has many more hyperparameters
than the other models. Because of this, it may require greater tune_depth
to optimize performance.

eta: Control for learning rate, [0, 1]

gamma: Threshold for further cutting of leaves, [0, Inf]. Larger is more conservative.

max_depth: Maximum tree depth, [0, Inf]. Larger means more complex models and so greater likelihood of overfitting. 0 produces no limit on depth.

subsample: Fraction of data to use in each training instance, (0, 1].

colsample_bytree: Fraction of features to use in each tree, (0, 1].

min_child_weight: Minimum sum of instance weight need to keep partitioning, [0, Inf]. Larger values mean more conservative models.

nrounds: Number of rounds of boosting, [0, Inf). Larger values produce a greater likelihood of overfitting.

**Regularized regression**: "glm". Regression and classification.
Implemented via `glmnet`

.

alpha: Elasticnet mixing parameter, in [0, 1]. 0 = ridge regression; 1 = lasso.

lambda: Regularization parameter, > 0. Larger values make for stronger regularization.

1 |

Vector of currently-supported algorithms.

`hyperparameters`

for more detail on hyperparameter
defaults and specifications

healthcareai documentation built on Sept. 2, 2018, 1:03 a.m.

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