caret (version 5.07-001)

avNNet.default: Neural Networks Using Model Averaging

Description

Aggregate several neural network model

Usage

## S3 method for class 'default':
avNNet(x, y, repeats = 5, bag = FALSE, ...)
## S3 method for class 'formula':
avNNet(formula, data, weights, ..., 
        repeats = 5, bag = FALSE, subset, na.action, contrasts = NULL)
## S3 method for class 'avNNet':
predict(object, newdata, type = c("raw", "class"), ...)

Value

• For avNNet, an object of "avNNet" or "avNNet.formula". Items of interest in the output are:
• model
  a list of the models generated from nnet
• repeats
  an echo of the model input
• names
  if any predictors had only one distinct value, this is a character string of the remaining columns. Otherwise a value of NULL

Details

Following Ripley (1996), the same neural network model is fit using different random number seeds. All of the resulting models are used for prediction. For regression, the output from each network are averaged. For classification, the model scores are first averaged, then translated to predicted classes. Bagging can also be used to create the models.

References

Ripley, B. D. (1996) Pattern Recognition and Neural Networks. Cambridge.

See Also

nnet, preProcess

Examples

data(BloodBrain)
modelFit <- avNNet(bbbDescr[, 1:10], logBBB, size = 5, linout = TRUE, trace = FALSE)
modelFit

predict(modelFit, bbbDescr[, 1:10])