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Biometrika 1985 72(1):223-226; doi:10.1093/biomet/72.1.223
© 1985 by Biometrika Trust
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MISCELLANEA

Role of the Papadakis estimator in one- and two-dimensional field trials

N. R. DRAPER and D. FARAGGI

Department of Statistics, University of Wisconsin Madison, Wisconsin 53706, U.S.A.
Department of Biostatistics, Harvard School of Public Health Boston, Massachusetts 02115, U.S.A.

Field trials when observations are correlated with those in neighbouring or nearby plots in one dimension are examined. The relationships between maximum likelihood solutions and the well-known Papadakis estimator are clarified and it is shown that the Papadakis estimator is appropriate under one covariance assumption but not others.

Key Words: Correlated plot yields • Covariance structure • Maximum likelihood estimator • Papadakis's stimator


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