weights() extracts robustness weights or fitting
  (or prior) weights from a lmrob or glmrob object.
"weights"(object, type = c("prior", "robustness"), ...)"prior" (default), or  "robustness".object.
lmrob. The
  robustness weights are the weights assigned by the
  M-estimator of regression, $\psi(r_i/S) / (r_i/S)$. The robust
  coefficient estimate then numericarlly corresponds to a weighted least
  squares fit using the product of both types of weights as weights.
lmrob, glmrob and weights