Using Interval Selection: Manipulate What Is Taken Into Aggregation Of Individual Encoding Channels Of Altair

I am making an XY-scatter chart, where both axes show aggregated data. For both variables I want to have an interval selection in two small charts below where I can brush along the

Solution 1:

Interval selection cannot be used for aggregate charts yet in Vega-Lite. The error behavior have been updated in a recent PR to Vega-Lite to show a helpful message.

Solution 2:

Not sure if I understand your requirements correctly, does this look close to what you want? (Just added param selections on top of your vertically concatenated graphs)

Vega Editor