Hi Abani You need my 1983 Mathematical Geology paper, "Regression Revisited" which can be downloaded by folloing the publications link at http://uk.geocities.com/drisobelclark/resume
Or, with less math, "A simple alternative to Disjunctive Kriging" written with Flemming Clausen in 1981 (TransIMM). Also on the web. I have seen later papers which propose similar with a lot more mathematics. Hope this helps Isobel Abani R Samal <[EMAIL PROTECTED]> wrote: My First question: I am using a mining software to get a krigged block model. The tool also saves a parameter called "Slope of Regression". The "Slope of Regression" is defined as (Block Variance Kriging Variance +Lagrange_multiplier)/(Block_variance-KrigingVariance+2*abs(Lagrange_Multiplier)) provided the denominator is not zero. Unfortunately, there is NO literature available (Including no help file). I have hard time to understand what this "Slope of Regression"means and how this slope is usable. I'll highly appreciate your thought on this. My second question: If s is the sample, v is the block and V is the whole panel of blocks or the whole deposit, the Kriges additive relation can be written as: ó 2 (s,V) = ó2(s,v) + ó2(v,V) But how is: ó2(s,V) related to ó2ok? (ó2okKriging variance), under what condition? Abani R Samal Lakewood, CO __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com