I have a question about Treemap. I understand treemaps use a series of nested rectangles to represent hierarchical relationships of parts to whole. My understanding is that parts (rectangles) should always add up to 100% (the whole). For instance, the whole can be three comparison groups in a Treemap, or can be just one large group by itself. In the comparison groups case, each comparison group is a whole, and rectangles within the group should add up to 100%.
However, recently I saw a treemap that has percentage labels for all nested rectangles, the percentages don't add up to 100%. There is no obvious comparison groups in the graph either. I am wondering if I need to label rectangles in a treemap with a percentage, what best practice should I follow to avoid mis-interpretation? Thank you!
Treemaps show parts of a whole, so they should add up to 100% (of whatever data is being included after filtering, etc.). Showing labels for percentages aren't always necessary, but it largely depends on what you're trying to accomplish. Can you share the treemap you saw which led to this confusion?