On the Uniqueness of the Line of Organic Correlation

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Abstract
Individuals in biological populations are frequently described in terms of 2 or more quantitative characteristics. Frequently it is desirable to represent the joint distribution of these characteristics by a single straight line. For this purpose the diagonal line of organic correlation has been proposed. It passes through the mean of the distribution, has its direction numbers proportional in absolute value to the standard deviations and has the signs of its direction numbers determined by the signs of the covariances. It is directly related to the allo-metric line in that portion of biometry usually referred to as allometry. The author justifies the choice of this particular line on the basis of several objective requirements, including its use for predictive purposes. The paper deals only with the proper choice of a line when the population is completely specified. Sampling problems are not discussed.

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