Hi Did you look for the presence of trend?
Bye Sebasatiano T. ---------- Initial Header ----------- >From : [EMAIL PROTECTED] To : [email protected] Cc : Date : Mon, 15 Oct 2007 01:03:22 -0700 (PDT) Subject : AI-GEOSTATS: Smoothness of indicator kriging over ordinary kriging > Dear list > I have a data set of highly positively skewed. > I tried to use indicator kriging to improve the estimation accuracy over OK. > But I found out some difficulties: > 1- The omnidirectional semivariogram show a strong to moderate spatial > correlation whereas indicator semivariograms except for 0.1 and 0.8 quantiles > do not show any spatial correlation. > 2- I tried to use some quantiles, which their indicator kriging show a weak > spatial correlation. I run IK with 5 possible cutoffs. The estimation > accuracy goes a little bit higher however the map produced using IK is much > smoother than OK. > I do not know why this happen? And what should I do now? > I really need help. Please let me know your opinion about that. > Best regards > Suzaneh > > > > --------------------------------- > Check out the hottest 2008 models today at Yahoo! Autos. ------------------------------------------------------ Leggi GRATIS le tue mail con il telefonino i-modeĀ di Wind http://i-mode.wind.it/ + + To post a message to the list, send it to [email protected] + To unsubscribe, send email to majordomo@ jrc.it with no subject and "unsubscribe ai-geostats" in the message body. DO NOT SEND Subscribe/Unsubscribe requests to the list + As a general service to list users, please remember to post a summary of any useful responses to your questions. + Support to the forum can be found at http://www.ai-geostats.org/
