PopulationVarianceCalculator (OpenGamma Strata)

java.lang.Object
- com.opengamma.strata.math.impl.statistics.descriptive.PopulationVarianceCalculator

All Implemented Interfaces:

Function<double[],Double>
```
public class PopulationVarianceCalculator
extends Object
implements Function<double[],Double>
```
Calculates the population variance of a series of data.
The unbiased population variance $\mathrm{var}$ of a series $x_1, x_2, \dots, x_n$ is given by: $$ \begin{align*} \text{var} = \frac{1}{n}\sum_{i=1}^{n}(x_i - \overline{x})^2 \end{align*} $$ where $\overline{x}$ is the sample mean. For the sample variance, see SampleVarianceCalculator.

- Constructor Summary
  
  Constructors
  Constructor Description
  
  PopulationVarianceCalculator()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  Double apply(double[] x)
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  - Methods inherited from interface java.util.function.Function
    andThen, compose

- Constructor Detail
  - PopulationVarianceCalculator
```
public PopulationVarianceCalculator()
```
- Method Detail
  - apply
```
public Double apply(double[] x)
```
    Specified by:
    
    apply in interface Function<double[],Double>