[R] R-square in robust regression

[PARKERSO]

Hi there,
I have just started using the MASS package in R to run M-estimator robust
regressions. The final output appears to only give coefficients, degrees of
freedom and t-stats. Does anyone know why R doesn't compute R or R-squared
and why doesn't give you any other indices of goodness of fit?
Does anyone know how to compute these in R? 
Sophie

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