"You could try rlm in the MASS package; it doesn't use he resampling step." That seems to do the trick. Thank you! -- View this message in context: http://r.789695.n4.nabble.com/Robust-regression-error-Too-many-singular-resamples-tp2286585p2287468.html Sent from the R help mailing list archive at Nabble.com.