[SOLR-11160] Add normalDistribution, uniformDistribution, sample and kolmogorovSmirnov Stream Evaluators

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Resolved
• Fix Version/s: 7.1, 8.0
• Assignee: Joel Bernstein
• Reporter: Joel Bernstein
• Created: 27/Jul/17 16:32
• Updated: 08/Oct/19 14:50
• Resolved: 17/Oct/17 19:29

Description

This ticket digs deeper into probability distributions, which are a key foundation of statistics.

Three new functions are introduced:

1) normalDistribution: This is a distribution function which returns a normal distribution generator. It is designed to be used with both the sample and the kolmogorovSmirnov functions. Eventually a function will be added for every distribution supported by Apache Commons Math.

2) sample: Returns array of numbers that conforms to a given distribution. You pass it a distribution function and size and it returns the array that conforms to the distribution.

3) kolmogorovSmirnov: Performs a goodness of fit test for distributions. This function can will do both a one and two side test. The one sided test compares a sample to a distribution function. The two sided test compares two samples to see if that were pulled from the same distribution.

Issue Links

• is related to: SOLR-10651 Streaming Expressions statistical functions library