dear experts, i hv tried to put a different weights for regression using MM-estimator by using the command: lmrob(y ~ x, weights = w2rdf) where weights are uniquely derived. somehow, R gives me Error - "Weights are not yet implemented for this estimator". In S-plus, similar command lmRobMM(y~x, weights=w2rdf) execute correctly. Please help. TQ. [[alternative HTML version deleted]]