Histogram displayed should reflect the results of a filter or filters applied on variables other than the x-axis variable of the histogram. It would be very useful to be able to (optionally?) see the histogram both before and after the application of the filter. (That is, to see the two histograms over-plotted.)
When doing so, there must be choices available for the vertical scaling - at a minimum, a choice between displaying both on the same scale, thus showing quantitatively the data that have been removed as well (as the space between the two histograms), or autoscaling both independently (more useful when most of the data have been removed by the filter, making the post-filter histogram uselessly shallow when displayed at the same scale).
- option to whether displaying histograms both before and after filter(s) applied
- option to select the scaling (same for both, or autoscale for each histogram)
- design the UI layout
- implement it