If you have multipl esamples at certain locations, what you can do is to modify the diagonal entry in your kriging system. Instead of gamma(0)=0 put in gamma(0)=(n-1)/n times nugget effect. This tells the kriging system you have replicates and it will adjust weights and optimal estimator accordingly.
This is documented in Matheron's original works. Isobel Clark http://uk.geocities.com/drisobelclark ____________________________________________________________ Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie -- * 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