Thanks Donald, I think what you mean by "adequately" is the sampling with CSR (complete spatial randomness) -- please correct me if I'm wrong. But I still have problem about estimating the variance. I mean, even if we sample with CSR, wouldn't the sample variance still be smaller than the sill value? I'd think that unless we restrict our sampling location far enough from each other, the sample variance calculated by S^2 will not reach the sill value. . .
Meng-ying > If correctly (or maybe you would want to say "adequately" ) estimated, > the sill of a second order stationary random function would be the > variance of the random function. In general, the sample variance will > not estimate the sill (because you are not using random sampling). > > Donald Myers > http://www.u.arizona.edu/~donaldm > >
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