A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . ± .0142 The theory of this second method is explained in un-technical language by Pearson in the Grammar ofScience (1900. pp. 432-436). We will proceed at oncewith a description of the manner in which the theory isapplied in the calculation of r. 190 REFERENCE HANDBOOK OF THE 5IEDICAL SCIENCES. \ The material is arranged in a fourfold correlation tablelike tlie following: OF STATURE AND BREADTFI OF HEAD. 3,11(10 CRIMI-NALS. (
A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . ± .0142 The theory of this second method is explained in un-technical language by Pearson in the Grammar ofScience (1900. pp. 432-436). We will proceed at oncewith a description of the manner in which the theory isapplied in the calculation of r. 190 REFERENCE HANDBOOK OF THE 5IEDICAL SCIENCES. \ The material is arranged in a fourfold correlation tablelike tlie following: OF STATURE AND BREADTFI OF HEAD. 3,11(10 CRIMI-NALS. (Macdonell.) Head breadth(centimetres). and Stature in Feet and Inches. 5 4^ and under. 1,034 Over 5 4/5-. 6?2l,;e4 1,946 1,(177 3,0ti0 OF PREVIOUS AND OF AND FULHAM HOSPITALS (DOlBTFrL CASES CLIDED). (Macdonell.) Recoveries. Deaths. Totals. Vaccinated 8,2071,434 693 1 1111! 8,899 Totals 9,(Sil 1,710 11,43(1 . Let the correlation table be represented by the follow-ing diagrams; Table of Frequencies. a b a + b c d c + d a -\- c b + d N. a^ ? Fig. Diagram Showing the Theoretical Relation ot the Tableof Frequencies to a Normal Correlation Surface. The shaded rect-angles a. h. c. d represent the divisions of the table of and/f the deviations of the lines of division from the meansof subject and relative represented by the axes of y and .r. (FromPearson.) Calculate the values of n, and a„ by the formuloe_ (a + r) - (A + d) - A • (a + i) - (c + f/) y Now we need a table of the probability integral,which gives the sums from the beginning of the nor-mal curve of frequency. In Biometrika, vol. ii.,pp. 182-190, is a series of tallies of this kind preparedespecially for our purpose. Turning to Tables III. andIV., pp. 18ij-190, we find in the a column our value of o,and in the .r column read ott the corresponding tabularentry, interpolating if necessary, and the valuethiis o
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