You can create a Venn diagram for a multiple-response element or a compact group. If there are more than three items, Protobi will seek a reasonable approximation.
In this example, respondents were asked what device(s) they owned in a check-all-that-apply question:
Venn diagrams also work with individual elements that can have multiple values. You can transform a compact group into a multiple-value discrete element by choosing "Transform..." from the context menu and selecting "Compact":
Press the square edit icon for the question and select "Chart type..." from the context menu. This will bring up a Chart dialog:
Select the button for Venn diagrams and press Ok
You can specify your own colors:
To specify colors, select "Edit JSON..." from the context menu and create an attribute
mapping value keys to CSS colors:
Often checkbox questions like these often include a final category "None of these", as in this example. This last category doesn't really make sense in a Venn Diagram.
You can remove an item either by removing is as a child from the parent group or hiding the element in the tree:
Venn diagrams also export to PowerPoint. Right now Venn diagrams export as images but we are working to export them as native PowerPoint shapes.
It's one thing to see a nice chart but each dataset often has some complexity. Contact Protobi support firstname.lastname@example.org to discsuss your dataset.