further arguments passed to or from other methods.
Value
The function summary.treg computes and prints
statistics of "lm" class objects as
well as the robust estimates of coefficients, the disparity and
'r', the degrees of freedom.
References
Aitkin, M., Francis, B., Hinde, J. and Darnell, R. (2009).
Statistical Modelling in R, OUP.