This would also enable calculation of percentiles.
Percentile calculation would also be possible if the user could use nested substitution parameters in array functions. For example:
RecVals := RecordedValues('Attribute1', start, end)
CountLower := MapData(RecVals, ArrayLength(FilterData(RecVals, $$val < $val)))
Percentiles := MapData(CountLower, $val / ArrayLength(CountLower))
In this example, $$val would be a nested substitution parameter applied to the FilterData call, and $val would apply to the enclosing MapData call, within the CountLower variable.
