Chris We have always found that estimating the semi-variogram from the reiduals of a global trend was sufficient, provided care is taken to use the cross validation to avoid 'over fitting'. I guess this is also true for genuine first-stage UK as well!
One of the free tutorials which is downloadable from the web, on the Wolfcamp data, illustrates this. Isobel http://ecosse.ontheweb.com/softwares ________________________________________________________________________ Want to chat instantly with your online friends? Get the FREE Yahoo! Messenger http://uk.messenger.yahoo.com/ -- * 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
