# rfeControl

0th

Percentile

##### Controlling the Feature Selection Algorithms

This function generates a control object that can be used to specify the details of the feature selection algorithms used in this package.

Keywords
utilities
##### Usage
rfeControl(functions = NULL,
rerank = FALSE,
method = "boot",
saveDetails = FALSE,
number = ifelse(method == "cv", 10, 25),
verbose = TRUE,
returnResamp = "all",
p = .75,
index = NULL,
workers = 1,
computeFunction = lapply,
computeArgs = NULL)
##### Arguments
functions
a list of functions for model fitting, prediction and variable importance (see Details below)
rerank
a logical: should variable importance be re-calculated each time features are removed?
method
The external resampling method: boot, cv, LOOCV or LGOCV (for repeated training/test splits
number
Either the number of folds or number of resampling iterations
saveDetails
a logical to save the predictions and variable importances from the selection process
verbose
a logical to print a log for each external resampling iteration
returnResamp
A character string indicating how much of the resampled summary metrics should be saved. Values can be final'', all'' or none''
p
For leave-group out cross-validation: the training percentage
index
a list with elements for each external resampling iteration. Each list element is the sample rows used for training at that iteration.
workers
an integer that specifies how many machines/processors will be used
computeFunction
a function that is lapply or emulates lapply. It must have arguments X, FUN and .... computeFunction can be used to build models in parall
computeArgs
Extra arguments to pass into the ... slore in computeFunction. See the examples in rfe.
##### Details

Backwards selection requires function to be specified for some operations.

The fit function builds the model based on the current data set. The arguments for the function must be:

• x
{ the current training set of predictor data with the appropriate subset of variables} y{ the current outcome data (either a numeric or factor vector)} first{ a single logical value for whether the current predictor set has all possible variables} last{ similar to first, but TRUE when the last model is fit with the final subset size and predictors.} ...{optional arguments to pass to the fit function in the call to rfe}

• A list

##### code

nbFuncs

##### itemize

• y

##### item

• x
• x
• y
• metric
• maximize
• size

##### pkg

caret

rfe, lmFuncs, rfFuncs, treebagFuncs, nbFuncs, pickSizeBest, pickSizeTolerance