I have a "Highlight Table" type graph with one dimension on the rows and one dimension on the columns. There is a mark for each combination that is highlighted based on the number of records. (i.e the darkest squares have the most records.) For example, I have "Type of injury" (fracture, concussion, cut, etc.) as a dimension and "cause of injury" (slip, fall, trip, etc.) for another. I am trying to filter this chart dynamically so that it always shows the top X marks. Here is what I have tried...
1. creating 2 combined sets, one for each dimension and filtering based on those sets.
2. creating a "combined dimension"... this works well for creating all of the marks, but I can't filter this for "Top" like I can for other filters.
This needs to work dynamically based on other variables, so I can't just create a group based on what is on the chart at any given time.