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Posted to dev@commons.apache.org by Gilles Sadowski <gi...@harfang.homelinux.org> on 2012/07/23 15:01:39 UTC
[Math] Percentile (low number of samples)
Hi.
It could be considered strange that CM reports 0.2 (instead of some value
close to 1) as the 10-percentile of the { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }
array.
Quoting the Javadoc:
---
For large samples, the different methods
agree closely, but when sample sizes are small, different methods will
give significantly different results.
---
Nevertheless, shouldn't such a difference from the expected result lead to
wonder whether the implementation should switch to another algorithm for
small datasets?
Thanks,
Gilles
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