Anirudh Joshi created STATISTICS-77:
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Summary: Implement Sum
Key: STATISTICS-77
URL: https://issues.apache.org/jira/browse/STATISTICS-77
Project: Commons Statistics
Issue Type: Sub-task
Components: descriptive
Reporter: Anirudh Joshi
This implementation uses {{commons-numbers}}
[Sum|https://github.com/apache/commons-numbers/blob/master/commons-numbers-core/src/main/java/org/apache/commons/numbers/core/Sum.java]
as the underlying implementation.
This may be further expanded to include various other Sum implementations like
`[Kahan Sum|[https://en.wikipedia.org/wiki/Kahan_summation_algorithm]],
{{Neumaier Sum}} (Two sum method) etc. with the option for the users to choose
an implementation. However, before beginning the implementation of various
other algorithms it may be worthwhile to discuss and investigate the relative
speed of the current Sum implementation compared to {{DoubleStream.sum}}
through JMH benchmarks.
When we know the different speeds, it would be more clear if the user should
have a choice for this statistic, e.g. * When using {{DoubleStream.sum}} is too
slow and it would be nice to have a simple sum variation.
* When the sum has a lot of cancellation and {{DoubleStream.sum}} suffers from
random walk around zero.
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