[QGIS-Developer] Quantile (Equal Count) broken or is data borked?

[Paolo Cavallini]

You're right, sorry.
Any way to improve this, perhaps taking a larger sample to reduce variation?
Thanks.

Il 3 marzo 2019 05:33:04 CET, Nyall Dawson <nyall.dawson at gmail.com> ha scritto:
>On Sat, 2 Mar 2019 at 22:09, Paolo Cavallini <cavallini at faunalia.it>
>wrote:
>
>> we also noticed that for large data sets (tens of thousands records)
>> `Pretty breaks` classification behaves strangely: when clicking on
>> Classify repeatedly, classes boundaries change by about 10% all the
>> time, apparently in a random fashion.
>> Unsure whether this is the same or a different issue.
>
>Do you mean pretty breaks or natural breaks (Jenks)? Jenks has been
>that way forever -- by design (for performance) it takes a random
>sample of the layer and generates the breaks from that sample only.
>The random samples is selected anew with each click of classify, which
>results in the different breaks.
>
>Nyall
>
>> All the best.
>> --
>> Paolo Cavallini - www.faunalia.eu
>> QGIS.ORG Chair:
>> http://planet.qgis.org/planet/user/28/tag/qgis%20board/
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-- 
Sorry for being short
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