Hello All The common 'Normal Score' transform assumes one population. Transformations such as rank or logarithm do not assume one population.
The best way to identify likely mixtures is with programs such as Peter MacDonald's Mix (cited in Ruben's email I think): http://www.math.mcmaster.ca/peter/mix/mix31.html or with probability plots. Many software packages have these and mixtures are easily identifiable by break-points or points of inflexion in the plot. For those (like myself) without easy access to libraries, there are a couple of papers which describe (geological) applications and using a combination of indicator and ordinary kriging to solve some problems. Papers can be found at http://uk.geocities.com/drisobelclark/resume follow the publications link. Look for my 1974 paper, now available in pdf format, the 1993 IMGC paper and the 1992 Troia paper with Jonathan Vieler. We have had good experience with this approach for 30 years in fields as diverse as mineral resource estimation and seabird preservation. Isobel Clark http://geoecosse.bizland.com/courses.htm ___________________________________________________________ Yahoo! Messenger - Communicate instantly..."Ping" your friends today! Download Messenger Now http://uk.messenger.yahoo.com/download/index.html -- * 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
