Venn Diagram
This visual appears to give incorrect results when 4 fields are selected.
I can do 3 just fine but 4 doesn't calculate properly, e.g., a category with 30 items shows 20, 4, 0, 0 instead of adding to 30.
My math could be off, though. I think with 4 categories there's no way to actually show the top & bottom categories (or left & right) intersecting since they already overlap in the middle. Maybe that's just a limitation of Venn diagrams; in that case maybe limit it to 3 categories?
3 categories: correct figures; each category adds to 8.4 categories: Something is wrong; categories add to 7.
Data is standard 4 variable w/ 2 options per variable.
Hi spotpuff,
Please make sure all the rows in your input table are UNIQUE. You can do it by adding ID column (but ignore it in R script).
The rows are unique; I was using an illustrative example but I was using the diagram on a real dataset which has a row ID type field and I was still having problems with the 4 dimensional Venn diagram.
The issue is likely something to do with more than 3 categories requiring strange diagrams:
https://en.wikipedia.org/wiki/Venn_diagram#Extensions_to_higher_numbers_of_sets
The visual doesn't make the 4th category into that "rainbow" type thing, so the math might be off.
Or I might be wrong.
Either way for now I'm sticking with 3 categories as the math works out in that diagram.