What is 'Bisquare method'?

[Alzy]

Hi there!

There are three ways of calculating model's coefficients, namely least square, least absolute and bisquare. I need some information on the last one. I thought it was a weighted least square. I don't have a matrix of weights. However, eventually it does estimate all the coefficients, and the thing is, I don't have a clue how. I'm aware of the two method, the third leaves me a bit puzzled.

[altenbach]

Have you looked at the help? It is explained there. (see e.g. at bottom of this page)

(there are several functions that support bisquare, which one are you talking about specifically?)