Before I re-invent the wheel… Do a sigma-clip function exist (similar to scipy.stats.sigmaclip) in some Julia package, preferable which works also on DataFrames !?
There is an implementation in Photometry.jl.
(Of course, it’s only a few-line function, so simple enough to implement yourself … unlike in Python where this would require user code in the inner loop, or alternatively multiple temporary arrays from vectorized comparisons, and would hence be slow.)
For future readers, this functionality has been moved from Photometry.jl to BackgroundMeshes.jl.