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Venn/Euler Diagrams 15:50, 13 July 2007 (CEST) : I am not sure if Venn diagrams are really important. Is there really a need in those? Especially offered by a program like OOo chart? Maybe we could have some facility of showing overlapping objects in Draw. How would data look for a chart with two circles A and B overlapping "a bit"

Tonygalmiche 17:56, 13 July 2007 (CEST) : Me too (I am not sure if Venn diagrams are really important). My priorities are :

  • Combined charts
  • Surface Chart
  • Bubble Chart/ Circles Plot
  • Gantt Charts
  • Negative value in a percent chart

Discoleo 19:15, 13 July 2007 (CEST) : Venn/Euler diagrams [I am somewhat misusing the term Venn diagram] are very useful when plotting overlapping categorical data, e.g.:
* 800 patients take medicine A
* 170 take B
* 90 take both A+B
* in addition we may wish to display the mortalities in the 3 groups
I would like to be able to draw a diagram that displays this data. Optimally, it should depict the magnitude of the groups as differing surface areas [with some variation from the true magnitude, for optimal visual representation].
This is even more useful when analysing more than 2 groups of data:
* e.g. the distribution of 5 diseases in a group of 5000 patients
* there are A, B, C, D, E and various overlappings of those diseases
* in principle, only important overlappings (> 1% of patients) should be shown
* again, we may add additional information, like mortality to the graph
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