centralValue: Obtain statistic of centrality

In DMwR: Functions and data for "Data Mining with R"

Description

This function obtains a statistic of centrality of a variable given a sample of its values.

Usage

centralValue(x, ws = NULL)

Arguments

x	A vector of values (the sample).
ws	A vector of case weights (defaulting to NULL, i.e. no case weights).

Details

If the variable is numeric it returns de median of the given sample, if it is a factor it returns the mode. In other cases it tries to convert to a factor and then returns the mode.

Value

A number if the variable is numeric. A string with the name of the most frequent nominal value, otherwise.

Author(s)

Luis Torgo [e-mail]

References

Torgo, L. (2010) Data Mining using R: learning with case studies, CRC Press (ISBN: 9781439810187).

http://www.dcc.fc.up.pt/~ltorgo/DataMiningWithR

See Also

mean, median

Examples

# An example with numerical data
x <- rnorm(100)
centralValue(x)
# An example with nominal data
y <-
factor(sample(1:10,200,replace=TRUE),levels=1:10,labels=paste('v',1:10,sep=''))
centralValue(y)

Example output

Loading required package: lattice
Loading required package: grid
[1] 0.07926276
[1] "v7"

DMwR documentation built on May 1, 2019, 9:17 p.m.