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On the positivity of a variance-estimator. (English) Zbl 0149.14808

Keywords:

statistics
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References:

[1] Koop, J. C.: On the Axioms of Sample Formation and their Bearing on the Construction of Linear Estimators in Sampling Theory for Finite Universes – III, Metrika 7 (1963), 165–204. · Zbl 0117.36802
[2] Murthy, M. N.: Ordered and Unordered Estimators in Sampling without Replacement, Sankhya, 18 (1957), 379–390. · Zbl 0081.36005
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