[RsR] hubers m-estimator in R / SPSS

[Manfred Hammerl]

hello, i'm new to robust statistics but found out very quick that R
(used huber, hubers and huberM) and SPSS (huber m-estimator) calculate
different location estimates, given the same tuning constant k. since
the differences a really not very small, i wanted to get some detailed
information about this but i couldn't find out which algorithm SPSS uses
to calculate hubers estimator so far...

does anyone know something about SPSS's huber function?

greetings,

manfred