Alex Herbert created STATISTICS-84:
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Summary: Create the Mean from array input using a summation
Key: STATISTICS-84
URL: https://issues.apache.org/jira/browse/STATISTICS-84
Project: Commons Statistics
Issue Type: Improvement
Components: descriptive
Reporter: Alex Herbert
The creation of the Mean from an array uses the rolling mean algorithm. This
requires a divide for each input value. The algorithm is slow when compared to
a simple sum of the values and a divide of the sum. The advantage is that the
algorithm is overflow safe and computes the mean in a single pass (useful for
streams).
In the majority of use cases a sum will not overflow. Change the array
construction to attempt a sum to compute the mean, reverting to the rolling
mean if this fails.
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