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Co-Relations and their Measurement, Chiefly from Anthropometric Data In: Proceedings of the Royal Society, Vol XVI No 274 Harrison and Sons. PAPERBACK. London, 1888. 8vo, wraps, (99) - 156 pp. Entire issue offered. Galton's contribution pp. 135-145. The first edition, first issue, of Dalton's pioneering article that would later become his measurement of correlation, or the correlation coefficient. Quite scarce in its original wraps. "In his effort to analyse the data that he had now collected Galton made another important contribution to the sciences of human genetics and biostatistics. He had constructed elaborate graphs on which he had entered mid-parental height (an average of the mother's and the father's height) on one axis and offspring height on the other. At the point of intersection, however, he had placed a number corresponding to the number of children of that height that had been, according to his data, produced by parents of the corresponding height. Galton immediately noticed that if he drew lines connecting the points of equal frequency (for example, all the ?4s? on his chart) they formed concentric ellipses, reminding him of meteorological charts that he had prepared years earlier. Furthermore, the straight line that connected the tangent points of those ellipses had a slope identical to the regression coefficient for his data. His knowledge of mathematics was sufficient to suggest to Galton that his graphs could be constructed from only three pieces of information: the probable error for each generation and the regression coefficient. When a professor of mathematics (J. D. Hamilton Dickson of Cambridge University) was able to do this construction without the original data, simply as a problem in analytic geometry, Galton realized that he had discovered a way to measure the relationship between the characteristics of two bodies of data, whether or not the two populations being studied were biologically related to each other?that he had discovered what was later called the measurement of correlation." - Oxford DNB. Front wrap mostly detached at seam, otherwise an excellent copy with some tiny chips to wraps at extremities and fine contents. Quite good overall. Quite scarce. Please contact us for additional pictures or information. . Good. 1888. First Edition. [Bookseller: Auger Down Books]
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