Dear List, I think I'd like to state my problem more clearly.
What I think to be the estimate of the overall variance is the expected variance in the future samples. This have to do with what kind of sampling scheme we use in the future, however. If we could assume the future samples to be enough apart from each other, then I'd have no problem using the sill value we calculated from the experimental variogram. Or, if we're talking about setting up a standard value so we could compare the maximum possible variances to that of other samples, I'd also have little doubt on the estimation using the sill value. Otherwise I think the sill value would be generally an over-estimation of the variance for a future sample, even for samples collected with complete spatial randomness in the future. And again, please correct me if I missed any important point along the discussion. I'd really like to be careful about (geo)stats, but probably not as careful about asking questions. Mng-yng
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