DMwR (version 0.4.1)

centralValue: Obtain statistic of centrality

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).

Value

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

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.

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)

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