Rebecca wrote: I might be really daft but is there an automatic way of getting the goodness-of-fit statistics for fitted variograms? The answer is, at least I believe, and correct me if I am wrong, no. This option was not included in the Gstat program on purpose because goodness-of-fit statistics can give the misleading impression of quality when they are high, but the choice of the model is in reality rather subjective. A method that you can apply to get the goodness-of-fit statistics - and that is normally applied at this institute - is to program the model that you fitted in a spreadsheet, read off the values of the experimental variogram in the Gstat variogram screen, note them in your spreadsheet as well and let the spreadsheet calculate the goodness-of-fit in the form of a r square (this is rather easy in Excel with the use of line fitting in a graph and selection of 'Display R squared', and in Quattro Pro using the menu Extra with Statistical functions). Instead of programming the model in the spreadsheet, you can also read off the values for the variogram model, put them next to the experimental variogram values, and let the spreadsheet calculate the r square, but this is of course even less precise - or you have to use a ruler on your computer screen - than the above mentioned method. At least it gives you an impression of the goodness-of-fit and you can compare roughly the different fits for different models. With greetings, Ivo Thonon -- Laboratorio de Edafolog�a Facultade de Ciencias Universidade da Coru�a Campus da Zapateira 15.071 A Coru�a Galicia, Espa�a
