Hi Jose, You can certainly compute semivariograms in the two cases you mentioned in your email, although the interpretation of the graph is not always straigthforward when you compare indicators to continuous variables. Examples of indicator cross semivariograms for categorical and continuous variables can be found in:
Goovaerts, P. 1994. Comparison of CoIK, IK and mIK performances for modeling conditional probabilities of categorical variables. In R. Dimitrakopoulos, editor, Geostatistics for the Next Century, pages 18-29. Kluwer, Dordrecht. Goovaerts, P. 1994. Comparative performance of indicator algorithms for modeling conditional probability distribution functions. Mathematical Geology, 26(3):389-411. I have also computed cross variogram between categorical indicators and continuous variables, although this work has never been published.. My plan was to use this semivariograms in cokriging and I looked also at ways to interpret the shape of these graphs. I believe you have should have mentioned the objectives of your analysis in your initial email, I bet you don't compute cross semivariograms for the pleasure... Pierre <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> Dr. Pierre Goovaerts President of PGeostat, LLC Chief Scientist with Biomedware Inc. 710 Ridgemont Lane Ann Arbor, Michigan, 48103-1535, U.S.A. E-mail: [EMAIL PROTECTED] Phone: (734) 668-9900 Fax: (734) 668-7788 http://alumni.engin.umich.edu/~goovaert/ <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> On Fri, 26 Mar 2004, [ISO-8859-1] José Manuel Blanco Moreno wrote: > Hi list, > I hope my question is not too basic, but I've been searching in the > literature and mail archives from ai-geostats & I couldn't find any > clear answer. > The same way there is the cross-semivariogram to describe the spatial > relationship between two continuous variables and the indicator > semivariogram (semivariogram of indicator variables): > -it is possible to use the cross-semivariogram for two indicator variables? > -can be used to describe the spatial distribution of a continuous > variable in relation to a indicator variable? > -any reference on this subject? > > Thank you very much. > > -- > José Manuel Blanco Moreno > Ph.D Student > > --------------------------------------- > José-Manuel Blanco-Moreno > > Dept. de Biologia Vegetal (Botànica) > Universitat de Barcelona > Av. Diagonal 645 > 08028 Barcelona > SPAIN > --------------------------------------- > > phone: (+34)93.402.1471 > fax: (+34)93.411.2842 > e-mail: [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 > > -- * 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
