View source: R/selector.info.gain.R
entropy.based | R Documentation |
The algorithms find weights of discrete attributes basing on their correlation with continous class attribute.
information.gain(formula, data, unit)
gain.ratio(formula, data, unit)
symmetrical.uncertainty(formula, data, unit)
formula |
A symbolic description of a model. |
data |
Data to process. |
unit |
Unit for computing entropy (passed to |
information.gain
is
H(Class) + H(Attribute) - H(Class, Attribute)
.
gain.ratio
is
\frac{H(Class) + H(Attribute) - H(Class, Attribute)}{H(Attribute)}
symmetrical.uncertainty
is
2\frac{H(Class) + H(Attribute) - H(Class, Attribute)}{H(Attribute) + H(Class)}
a data.frame containing the worth of attributes in the first column and their names as row names
Piotr Romanski, Lars Kotthoff
data(iris)
weights <- information.gain(Species~., iris)
print(weights)
subset <- cutoff.k(weights, 2)
f <- as.simple.formula(subset, "Species")
print(f)
weights <- information.gain(Species~., iris, unit = "log2")
print(weights)
weights <- gain.ratio(Species~., iris)
print(weights)
subset <- cutoff.k(weights, 2)
f <- as.simple.formula(subset, "Species")
print(f)
weights <- symmetrical.uncertainty(Species~., iris)
print(weights)
subset <- cutoff.biggest.diff(weights)
f <- as.simple.formula(subset, "Species")
print(f)
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.