robustbase (version 0.90-2)

weights.lmrob: Extract Robustness and Model Weights

Description

weights() extracts robustness weights or fitting (or prior) weights from a lmrob or glmrob object.

Usage

## S3 method for class 'lmrob':
weights(object, type = c("prior", "robustness"), ...)

Arguments

object

an object of class "lmrob" or "glmrob", typically the result of a call to lmrob, or glmrob, respectively.

type

the type of weights to be returned. Either "prior" (default), or "robustness".

...

not used currently.

Value

• Weights extracted from the object object.

Details

The prior weights correspond to the weights specified using the weights argument when calling 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 numerically corresponds to a weighted least squares fit using the product of both types of weights as weights.

See Also

lmrob, glmrob and weights