Has anyone encountered a problem with Surfer 8 and its settings for what concerns the search strategy and its impact on the nugget effect?
If you set the search option to "No Search" during the gridding step, and if you set any value for the nugget effect (the error variance here only, I kept the micro variance equal to zero), the cross-validation function of Surfer will give you always the same statistics for the residuals! However, if you set a large radius of search in the search option (as a result, the search strategy is the same as if you were using the "no search" option), then only one can see the impact of the nugget effect on the results. I have just asked the software developers for more info about this matter but was wondering if my approach was wrong or if this is what a believe a nasty bug. The output maps, however, seem to deal properly with the nugget effect. I presume that the cross-validation algorithm only is not correct. Any feedback would be appreciated. Have a nice week-end ! Gregoire -- * 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
