Joel Bernstein created SOLR-11160:
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Summary: Add normalDistribution, sample and kolmogorovSmirnov
Stream Evaluators
Key: SOLR-11160
URL: https://issues.apache.org/jira/browse/SOLR-11160
Project: Solr
Issue Type: New Feature
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Joel Bernstein
This ticket digs deeper into *probability distributions*, which are a key
foundation of statistics.
Three new functions are introduced:
1) *normalDistribution*: This is 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 a two side test. The one sided test compares a
sample to give distribution. The two sided test compares two sample to see if
that were pull from the same distribution.
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