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Synopsis: The bias associated with visual estimates can be removed if the true values for a few of the samples estimated can be determined. Equations for calculating the regression of the estimates on the actual values are given.
2 Professor of Botany, College of Agr., Jabalpur, M. P., India, (formerly post-doctoral scholar in Agronomy, University of Illinois), Professor of Crop Production, and Assistant Professor of Biometry, University of Illinois.
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