Package com.yahoo.search.grouping.request

Class StandardDeviationAggregator

java.lang.Object

com.yahoo.search.grouping.request.GroupingNode

com.yahoo.search.grouping.request.GroupingExpression

com.yahoo.search.grouping.request.AggregatorNode

com.yahoo.search.grouping.request.StandardDeviationAggregator

public class StandardDeviationAggregator
extends AggregatorNode

This class represents an stddev-aggregator in a GroupingExpression. It evaluates to population standard deviation of the values that the contained expression evaluated to over all the inputs.

Author:

bjorncs, bratseth

Constructor Summary

Constructors

Constructor	Description
StandardDeviationAggregator(GroupingExpression expression)	Constructs a new instance of this class.

Method Summary

Modifier and Type	Method	Description
StandardDeviationAggregator	copy()	Returns a deep copy of this

Methods inherited from class com.yahoo.search.grouping.request.AggregatorNode

getExpression, resolveLevel, visit

Methods inherited from class com.yahoo.search.grouping.request.GroupingExpression

asImage, asString, getLevel, getLevelOrNull, setLabel

Methods inherited from class com.yahoo.search.grouping.request.GroupingNode

getImage, getLabel, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

StandardDeviationAggregator

public StandardDeviationAggregator(GroupingExpression expression)

Constructs a new instance of this class.

Parameters:

expression - the expression to aggregate on.

Method Details

copy

public StandardDeviationAggregator copy()

Description copied from class: GroupingExpression

Returns a deep copy of this

Specified by:

copy in class GroupingExpression