Andrea We use Cressie's goodness of fit statistic which allows for number of pairs and other factors in semi-veriogram fitting. You can find a paper of his in Methematical Geology around 1992, or in his book. It is also illustrated in our free tutorial material at www.kriging.com Isobel
Andrea Sciarretta <[EMAIL PROTECTED]> wrote: Hi, Im working on variogram modelling and in the majority of cases only R2 is available to evaluate the best-fit values, but in cases of non-linear functions, it is very criticized. Are there other standard methods to evaluate the goodness of a fit of a non-linear function (for example asymptotic confidence intervals) and how to calculate them, considering that the majority of geostatistical software do not perform any alternative coefficient? Thank you Andrea