org.apache.mahout.cf.taste.impl.common

Interface RunningAverageAndStdDev

All Superinterfaces:

RunningAverage

All Known Implementing Classes:

FixedRunningAverageAndStdDev, FullRunningAverageAndStdDev, InvertedRunningAverageAndStdDev, WeightedRunningAverageAndStdDev

public interface RunningAverageAndStdDev
extends RunningAverage

Extends RunningAverage by adding standard deviation too.

Method Summary

Modifier and Type	Method and Description
double	getStandardDeviation()
RunningAverageAndStdDev	inverse()

Methods inherited from interface org.apache.mahout.cf.taste.impl.common.RunningAverage

addDatum, changeDatum, getAverage, getCount, removeDatum

Method Detail

getStandardDeviation

double getStandardDeviation()

Returns:

standard deviation of data

inverse

RunningAverageAndStdDev inverse()

Specified by:

inverse in interface RunningAverage

Returns:

a (possibly immutable) object whose average is the negative of this object's