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java.lang.Objectorg.zkoss.pivot.impl.calc.VarianceContext
public class VarianceContext
The context for calculating variance and standard deviation.
Field Summary | |
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protected int |
_ncount
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protected double |
_sqsum
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protected double |
_sum
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static ContextFactory<VarianceContext> |
FACTORY
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Constructor Summary | |
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VarianceContext()
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Method Summary | |
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void |
add(java.lang.Object item)
Add an item into the aggregation. |
int |
getNumberCount()
Retrieve number count. |
double |
getSum()
Retrieve sum of the numbers. |
double |
getSumOfSquare()
Retrieve sum of the square of the numbers. |
java.lang.Double |
getVar()
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java.lang.Double |
getVarP()
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void |
merge(VarianceContext ctx)
Merge from another context of the same type. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected double _sqsum
protected double _sum
protected int _ncount
public static final ContextFactory<VarianceContext> FACTORY
Constructor Detail |
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public VarianceContext()
Method Detail |
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public void add(java.lang.Object item)
Context
add
in interface Context<VarianceContext>
public void merge(VarianceContext ctx)
Context
merge
in interface Context<VarianceContext>
public double getSumOfSquare()
public double getSum()
public int getNumberCount()
public java.lang.Double getVar()
public java.lang.Double getVarP()
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