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2. “Missing observations in multivariate statistics—II. Point estimation in simple linear regression.”;Afifi;Journal of the American Statistical Association,1967
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4. “Missing observations in multivariate statistics—IV. A note on simple linear regression.”;Afifi;Journal of the American Statistical Association,1969
5. “A method of estimating the yields of a missing plot in field experimental work.”;Allen;Journal of the Agricultural Society,1930