List members: Can some or all of these transformations and distribution issues be comfortably eliminated using a non-parametric bootstrap approach to kriging? Not being an academic having easy access to a library, and not being affluent enough/willing to pay for on-line journal articles without seeing the content first, delving into the approach is not easy. I know that there has been some work in the area and a few pdfs using parametric bootstrap are available, but I am yet to find that nice introductory "aha!" document which which I can 'bootstrap' my understanding of the topic. Is there one?
I am specifically referring to material involving bootstrap techniques in kriging and not bootstrap in general--I've got plenty of good stuff there. I am also dusting off Chernick's Practitoner's Guide to see what is there but it's content is typically not "aha!" quality (for me). Regards, Michael --- Michael Grant <[EMAIL PROTECTED]> wrote: > Log versus nscore transform > ----- Original Message ----- > From: Gregoire Dubois > To: ai-geostats@jrc.it > Sent: Wednesday, August 09, 2006 4:15 AM > Subject: AI-GEOSTATS: Log versus nscore transform > > > Dear list, > > I am puzzled about the use of logarithmic and nscore transforms in > geostatistics. > > Given the apparent advantages in using nscore transforms over the logarithmic > transform (nscore has no problem when dealing with 0 values and is "managing" > the tails of the distribution very (more?) efficiently), why would one still > want to use log-normal kriging? Because of the mathematical elegance of using > a model only? > > Moreover, one can frequently not be "sure" about the lognormality of the > analysed dataset, so why would one still take the risk of using log-normal > kriging? > > Thank you in advance for any feedback on this issue. > > Best regards, > > Gregoire > > > > __________________________________________ > Gregoire Dubois (Ph.D.) > > European Commission (EC) > Joint Research Centre Directorate (DG JRC) > Institute for Environment and Sustainability (IES) > > TP 441, Via Fermi 1 > 21020 Ispra (VA) > ITALY > > Tel. +39 (0)332 78 6360 > Fax. +39 (0)332 78 5466 > Email: [EMAIL PROTECTED] > > WWW: http://www.ai-geostats.org > WWW: http://rem.jrc.cec.eu.int > > "The views expressed are purely those of the writer and may not in any > circumstances be regarded as stating an official position of the European > Commission." > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com + + To post a message to the list, send it to ai-geostats@jrc.it + 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/
