Hi everybody, Thanks for your answers. I had seen the similarity between the formulas, but I thought there could have been more to it than just similarity. Here is a summary of all responses. Cheers, Carolina
Hi. > I have a question which is not directly related to geostatistical analysis... > What is the relationship between the gaussian model > used in geostatistics and the "classical" gaussian function or > distribution, > or how it came to be known as a gaussian model? A partial answer to your question is simply that the functional form of the gaussian variogram is the same as the functional form for the probability density function for a gaussian random variable. Donald E. Myers http://www.u.arizona.edu/~donaldm Carolina The gaussian semi-variogram model is so-called because the formula is basically identical to that for the Normal (or gaussian) probability distribution. There is no other necessary link with the Normal distribution. Isobel (Clark) http://uk.geocities.com/geoecosse/news.html Carolina, yes ..... the Gaussian model ..... a misnoma really: it should be clear where the term comes from - just look at the functional form: it is identical to the functional form of a Gaussian. I always call this model the squared exponential covariance function (since there is nothing 'Gaussian' about it other than the form) - and by the way if you think in a processed based way this is a terrible variogram to use, unless you believe the field you are dealing with is really infinitely smooth (differentiable). cheers Dan -- Dr Dan Cornford Computer Science Tel: 0121 359 3611 x4667 Aston Univeristy Fax: 0121 333 4586 Birmigham, B4 7ET, UK Email: [EMAIL PROTECTED] URL: http://www.ncrg.aston.ac.uk/~cornfosd/ Gaussian distribution or normal distribution has a multiple of exp(-x^2) as its probability density function. Gaussian variogram has similar term in its definition. Hope this help. Thanks Abedini Hola Carolina: La ecuaci�n del variograma gaussiano es g(h)=C(1-exp(-(h/a)^2) el nombre gaussiano es un muy mal nombre y solo corresponde a la analog�a entre esta funci�n y el modelo normal. Atentamente, Marco Carolina Garcia Imhof M.Sc. student Marine Mammal Research Group Marine Science Department 310 Castle Street, PO Box 56 University of Otago Dunedin, New Zealand Fax: 64 3 479 8336 Phone: 64 3 479 5476 e-mail: [EMAIL PROTECTED] [EMAIL PROTECTED] -- * To post a message to the list, send it to [EMAIL PROTECTED] * As a general service to the users, please remember to post a summary of any useful responses to your questions. * To unsubscribe, send an email to [EMAIL PROTECTED] with no subject and "unsubscribe ai-geostats" followed by "end" on the next line in the message body. DO NOT SEND Subscribe/Unsubscribe requests to the list * Support to the list is provided at http://www.ai-geostats.org
