R: predict method for support vector object

predict.ksvm {kernlab} | R Documentation

## predict method for support vector object

### Description

Prediction of test data using support vector machines

### Usage

    ## S4 method for signature 'ksvm'
    predict(object, newdata, type = "response", coupler = "minpair")

### Arguments

`object` | an S4 object of class `ksvm` created by the `ksvm` function
`newdata` | a data frame or matrix containing new data
`type` | one of `response`, `probabilities` ,`votes`, `decision` indicating the type of output: predicted values, matrix of class probabilities, matrix of vote counts, or matrix of decision values.
`coupler` | Coupling method used in the multiclass case, can be one of `minpair` or `pkpd` (see reference for more details).

### Value

If `type(object)` is `C-svc`, `nu-svc`, `C-bsvm` or `spoc-svc` the vector returned depends on the argument `type`:

`response` | predicted classes (the classes with majority vote).
`probabilities` | matrix of class probabilities (one column for each class and one row for each input).
`votes` | matrix of vote counts (one column for each class and one row for each new input)

If `type(object)` is `eps-svr`, `eps-bsvr` or `nu-svr` a vector of predicted values is returned. If `type(object)` is `one-classification` a vector of logical values is returned.

### Author(s)

Alexandros Karatzoglou
alexandros.karatzoglou@ci.tuwien.ac.at

### References

- T.F. Wu, C.J. Lin, R.C. Weng.
  Probability estimates for Multi-class Classification by Pairwise Coupling
  http://www.csie.ntu.edu.tw/~cjlin/papers/svmprob/svmprob.pdf

- H.T. Lin, C.J. Lin, R.C. Weng
  A note on Platt's probabilistic outputs for support vector machines
  http://www.csie.ntu.edu.tw/~cjlin/papers/plattprob.pdf

### Examples

    ## example using the promotergene data set
    data(promotergene)

    ## create test and training set
    ind <- sample(1:dim(promotergene)[1],20)
    genetrain <- promotergene[-ind, ]
    genetest <- promotergene[ind, ]

    ## train a support vector machine
    gene <- ksvm(Class~.,data=genetrain,kernel="rbfdot",
                 kpar=list(sigma=0.015),C=70,cross=4,prob.model=TRUE)
    gene

    ## predict gene type probabilities on the test set
    genetype <- predict(gene,genetest,type="probabilities")
    genetype

[Package kernlab version 0.9-25 Index]