Bug report #6841

Variable Jenks classification in QGIS

Added by Robin Lovelace almost 8 years ago. Updated over 1 year ago.

Status:Closed
Priority:Normal
Assignee:-
Category:Symbology
Affected QGIS version:master Regression?:No
Operating System:Ubuntu Easy fix?:No
Pull Request or Patch supplied:No Resolution:end of life
Crashes QGIS or corrupts data:No Copied to github as #:15977

Description

When I re-classified the bins using Jenk's classification, the bin values change substantially.
Nothing else changes: I just clicked "Classify" and every time a slightly different result emerged.
This is strange behaviour (Jenk's classification is not probabilistic, but requires a certain number of iterations I belive http://en.wikipedia.org/wiki/Jenks_natural_breaks_optimization ).

To see this behaviour, please see this video:
http://www.youtube.com/watch?v=-Z1j9Zca9v0&feature=youtu.be

Is this behaviour repeated on other versions of QGIS?
Any ideas why it's happening?

Robin

History

#1 Updated by Jürgen Fischer over 6 years ago

  • Target version changed from Version 2.0.0 to Future Release - Lower Priority

#2 Updated by Christophe Damour about 5 years ago

Same problem here. Any news on this bug ?

#3 Updated by Giovanni Manghi over 3 years ago

  • Easy fix? set to No
  • Regression? set to No

#4 Updated by Giovanni Manghi over 1 year ago

  • Resolution set to end of life
  • Status changed from Open to Closed

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