AI-GEOSTATS: bounds of IK variograms

2003-06-16 Thread Dilling, Jörg
dear all, i have performed indicator kriging with different thresholds (corresponding to 10th percentiles). is it correct that the variogram of each xth-percentile is bounded to: max cov = xth_percentile* (1-xth_percentile) ?? e.g. max cov (30th perc.) = 0.21, max.cov (90th perc.) = 0.09

Re: AI-GEOSTATS: bounds of IK variograms

2003-06-16 Thread Isobel Clark
Jörg Don't confuse indicator variables with classical correlation coefficients. The maximum possible on your semi-variogram will be where all differences are 1. That is every pair is (1-0). And, of course, divided by 2. So the absolute maximum an indicator semi-variogram can show is 0.5.