Developments in numerical methods and the improved accessibility of corresponding software have greatly simplified the fitting of parametric physical models to observations. In particular, this applies to fitting in the sense of the (until recently intractable) non-differentiable criteria of goodness of fit as the sum of absolute deviations criterion and the minimax criterion. More than before, these methods and software enable one to investigate which criterion is best for a particular purpose: for example, the precision of the produced parameter estimates, the resolution of closely spaced parameters or robustness with respect to outliers. © 1984.
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