On Mon, 4 Mar 2019 at 02:21, Richard Duivenvoorde <[email protected]> wrote: > > On 03/03/2019 11.31, Richard Duivenvoorde wrote: > >>> https://duif.net/temp/QuantileEqualCount2.png > >> I can't reproduce. Maybe data set dependant? > > I've created random data in a geopackage and created an issue for it > > > > https://issues.qgis.org/issues/21451 > > Mmm, diving into this a little more (googling about Quantiles...), it > appears this has to do with ordering/ranking the data and then set 'breaks'. > > So in this dataset there seems to be A LOT of values '0' so if you first > order that dataset, then create the breaks/buckets, it is possible to > have several 'buckets' in the 0 range? So this then is not so much an > error in creating the breaks, but more the visualisation of the numbers > in the classes (IF it is indeed ok, to have several 'classes' all having > 0 both as min and as max value....). > Then QGIS should divide the 0-values over the 3 buckets all containing > zero's?
I had a look - as you suspect, it's impossible to divide your data into 10 equal sized buckets based solely on the distribution of values contained within it. > > OR am I just misusing a method?And should you not use this method in a > dataset in which the distribution is so uneven? That's my thoughts. You'll need to choose a different partitioning method. Nyall > > Anybody more into this statistical theory then I am?? > > > Regards, > > Richard Duivenvoorde > _______________________________________________ > QGIS-Developer mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer _______________________________________________ QGIS-Developer mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
