[STATISTICS-80] Implement Variance - ASF JIRA

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Details

Type: Sub-task
Status: Closed
Priority: Minor
Resolution: Implemented
Affects Version/s: None
Fix Version/s: 1.1
Component/s: descriptive
Labels:
None

Language:
- Java
difficulty-level:
Easy

Description

Computes the variance according to the SecondMoment.increment(double d) method in commons-math library. If the input array is known beforehand, such as in the Variance.of(double... values) method, a more accurate variance is computed using a two-pass, corrected algorithm, starting with computing the sum of squared deviations from mean and then correcting this by adding the squared sum of deviations normalized by the sample size.