Sampling designs and estimation procedures are considered for the spatial variogram when no information on magnitude or scale of variation of a spatial variable is available. Design-based solutions to ...
Welcome to Nat Geo Your Shot: National Geographic’s global community for aspiring visual storytellers. Find the community on Instagram @NatGeoYourShot and follow along for hashtag challenges, tips, ...
A version of this article appeared in the October 2006 issue of Harvard Business Review. Harvard Business Publishing: Copyright ©2026 Harvard Business School ...
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