makeCostMeasure

[<code>character(1)</code>]
Name of measure.
Default is &#8220;costs&#8221;.

[<code>logical(1)</code>]
Should the measure be minimized?
Otherwise you are effectively specifying a benefits matrix.
Default is <code>TRUE</code>.

minimize

[<code>matrix</code>]
Matrix of misclassification costs. Rows and columns have to be named with class labels, order does not matter.
Rows indicate true classes, columns predicted classes.

costs

[<code>function</code>]
How to combine costs over all cases for a SINGLE test set?
Note this is not the same as the <code>aggregate</code> argument in <code><a rd-options="" href="/link/makeMeasure?package=mlr&version=2.10" data-mini-rdoc="mlr::makeMeasure">makeMeasure</a></code>
You can set this as well via <code><a rd-options="" href="/link/setAggregation?package=mlr&version=2.10" data-mini-rdoc="mlr::setAggregation">setAggregation</a></code>, as for any measure.
Default is <code><a rd-options="" href="/link/mean?package=mlr&version=2.10" data-mini-rdoc="mlr::mean">mean</a></code>.

combine

[<code>numeric(1)</code>]
Best obtainable value for measure.
Default is -<code>Inf</code> or <code>Inf</code>, depending on <code>minimize</code>.

best

[<code>numeric(1)</code>]
Worst obtainable value for measure.
Default is <code>Inf</code> or -<code>Inf</code>, depending on <code>minimize</code>.

worst

[<code>character</code>] 
Name of the measure. Default is <code>id</code>.

name

[<code>character</code>] 
Description and additional notes for the measure. Default is &#8220;&#8221;.

note

Creates a cost measure for non-standard classification error costs.

Interface to a large number of classification and regression
techniques, including machine-readable parameter descriptions. There is
also an experimental extension for survival analysis, clustering and
general, example-specific cost-sensitive learning. Generic resampling,
including cross-validation, bootstrapping and subsampling. Hyperparameter
tuning with modern optimization techniques, for single- and multi-objective
problems. Filter and wrapper methods for feature selection. Extension of
basic learners with additional operations common in machine learning, also
allowing for easy nested resampling. Most operations can be parallelized.

Bernd Bischl

Machine Learning in R

makeCostMeasure function

[<code>function</code>]
How to combine costs over all cases for a SINGLE test set?
Note this is not the same as the <code>aggregate</code> argument in <code><a rd-options='' href='makeMeasure'>makeMeasure</a></code>
You can set this as well via <code><a rd-options='' href='setAggregation'>setAggregation</a></code>, as for any measure.
Default is <code><a rd-options='' href='mean'>mean</a></code>.

makeCostMeasure: Creates a measure for non-standard misclassification costs.

Description

Usage

Arguments

Value

See Also