Returns a smooth variant of the original ranvar to mitigate the overfitting issue.
Example:
table T = with // observation
[| as Obs |]
[| 1 |]
[| 0 |]
[| 0 |]
[| 2 |]
show scalar "ranvar(T.Obs)" a1c3 with ranvar(T.Obs)
show scalar "smooth(ranvar(T.Obs))" a4c6 with smooth(ranvar(T.Obs))
This function is typically intended to smooth ranvars produced through the ranvar aggregators over a handfew observations, and mitigate the most obvious artefacts caused by the limited set of observations.