If I have a point dataset with multiple values for the same geographic location (e.g. residuals from a regression where multiple individuals live at the same location) which I classify using quantile classification in QGIS, how does QGIS choose which quantile (in practice which color) to show on the map? For example, if there are three values for a single location with values falling within e.g. the first, second and fifth quantile, how does QGIS choose what to represent on the map?

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    I always thought it was the symbol ordering which is used to show what appears on the map going from bottom-up. E.g. if your order from top is 1st, 2nd, 5th, then the 5th symbology would be shown first, then 2nd etc. – Joseph Jun 17 '16 at 12:09
  • Ah! That does sound like a plausible explanation. – tekanna Jun 18 '16 at 9:29
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    You can also set the priority of which symbols should appear above others by setting the symbol levels. In your style interface, go to Advanced > Symbol levels and give each symbol a number (high numbers will be shown before low numbers). – Joseph Jun 20 '16 at 8:58

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