Talk:Redescending M-estimator

Scale?
It seems like redesigning M-estimators assume a certain window size. If I know that I expected Gaussian data with &sigma;=1, I could see using a redescending M-estimator that excluded points outside of five or six standard deviations, since that would start to be more likely to be an outlier than to be accurate data, but if I don't know &sigma; a-priori, how would I decide what window size to use? —Ben FrantzDale (talk) 15:09, 15 October 2008 (UTC)
 * yes this is the most important potential drawback of redescending M-estimators - I have expanded on the disadvantages Nick Mulgan (talk) 01:41, 26 September 2021 (UTC)

Notation
This article mainly uses a capital Ψ, but one ψ, while the [M-estimator] article uses the lower case ψ: is there a standard notation for this? Melcombe (talk) 15:25, 15 October 2008 (UTC)