GainRatioAttributeEval(formula, data, subset, na.action, control = NULL)
InfoGainAttributeEval(formula, data, subset, na.action, control = NULL)
Arguments
formula
a symbolic description of a model. Note that for
unsupervised filters the response can be omitted.
data
an optional data frame containing the variables in the
model.
subset
an optional vector specifying a subset of observations
to be used in the fitting process.
na.action
a function which indicates what should happen when
the data contain NAs. See model.frame for
details.
control
an object of class Weka_control, or a
character vector of control options, or NULL (default).
Available options can be obtained on-line using the Weka Option
Wizard WOW, or the Weka documentation.
Value
A numeric vector with the figures of merit for the attributes
specified by the right hand side of formula.
Details
GainRatioAttributeEval evaluates the worth of an attribute by
measuring the gain ratio with respect to the class.
InfoGainAttributeEval evaluates the worth of an attribute by
measuring the information gain with respect to the class.