org.apache.commons.math.stat.ranking
Interface RankingAlgorithm

All Known Implementing Classes:

NaturalRanking

public interface RankingAlgorithm

Interface representing a rank transformation.

Since:

2.0

Version:

$Revision: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 2009) $

Method Summary

double[]

rank(double[] data) Performs a rank transformation on the input data, returning an array of ranks.

Method Detail

rank

double[] rank(double[] data)

Performs a rank transformation on the input data, returning an array of ranks.

Ranks should be 1-based - that is, the smallest value returned in an array of ranks should be greater than or equal to one, rather than 0. Ranks should in general take integer values, though implementations may return averages or other floating point values to resolve ties in the input data.

Parameters:

data - array of data to be ranked

Returns:

an array of ranks corresponding to the elements of the input array