Peter Sorry, that "couple of days" turned into five weeks! I have put the addenda to the lognormal paper up as images at: http://www.kriging.com/publications/SAIMM_87_addenda.htm The one you are interested in is probably Addendum 2, with Sichel's maximum likelihood theory. I will put a proper link on the publications page when I get time. If you have any queries, come back to me. All the best Isobel
Peter Bossew wrote: Thanks Isobel for the very fast reply. There is no hurry... I am just curious because I never heard about Sichel's t before. Anyhow, my impression is that altogether the lognormal distribution is less trivial a thing than it may appear at first glance. (I am currently working on a paper about automatic identification of extrema / spatially: hot spots, by exploiting the differences of estimating the lognorm parameters from the data and from the moments, respectively.) Peter Isobel Clark writes: >Hi Peter > >Sorry about the addendum. You are quite correct, none of the addenda seem >to have made it onto the web page!