VarianceContext (ZK Pivot Table Components 3.1.0 API)

java.lang.Object
- org.zkoss.pivot.impl.calc.VarianceContext

All Implemented Interfaces:

Context<VarianceContext>
```
public class VarianceContext
extends Object
implements Context<VarianceContext>
```
The context for calculating variance and standard deviation.

Author:

simonpai

Field Summary

Fields
Modifier and Type Field Description

protected int _ncount

protected double _sqsum

protected double _sum

static ContextFactory<VarianceContext> FACTORY

Constructor Summary

Constructors
Constructor Description

VarianceContext()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(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.
`Double`	`getVar()`
`Double`	`getVarP()`
`void`	`merge(VarianceContext ctx)`	Merge from another context of the same type.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - _sqsum
```
protected double _sqsum
```
  - _sum
```
protected double _sum
```
  - _ncount
```
protected int _ncount
```
  - FACTORY
```
public static final ContextFactory<VarianceContext> FACTORY
```
- Constructor Detail
  - VarianceContext
```
public VarianceContext()
```
- Method Detail
  - add
```
public void add(Object item)
```
    Description copied from interface: Context
    
    Add an item into the aggregation.
    
    Specified by:
    
    add in interface Context<VarianceContext>
  - merge
```
public void merge(VarianceContext ctx)
```
    Description copied from interface: Context
    
    Merge from another context of the same type.
    
    Specified by:
    
    merge in interface Context<VarianceContext>
  - getSumOfSquare
```
public double getSumOfSquare()
```
    Retrieve sum of the square of the numbers.
  - getSum
```
public double getSum()
```
    Retrieve sum of the numbers.
  - getNumberCount
```
public int getNumberCount()
```
    Retrieve number count. Non-number objects are ignored.
  - getVar
```
public Double getVar()
```
  - getVarP
```
public Double getVarP()
```