On changes in the recorded mortality from cancer and their possible interpretation / by Major Greenwood, jun., and Frances Wood.

  • Greenwood, Major, 1880-1949.
Date:
1914
Catalogue details

Licence: In copyright

Credit: On changes in the recorded mortality from cancer and their possible interpretation / by Major Greenwood, jun., and Frances Wood. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    16/54 (page 14)
    applied (by the method of least squares) to index numbers formed by taking the mean rate of each series as 100, and Table Ia contains the data and gradients of the fitted lines. These constants and Diagram IIa. Index numbers showing the changes in the crude death-rates from cancer for three urban and three rural registration counties with the best fitting straight lines,* 1881-1900. Persons. * The tangents of the angles made by straight lines drawn upon this diagram with the abscissae are not equal to the values given in the last line of Table I. This is because an arbitrary unit has been chosen in order to make a convenient diagram. Since the same unit has been used throughout the lines are perfectly comparable one with another. This applies to the diagrams throughout the paper, but in every case the unit chosen has been the same— viz., the base unit is five times as large as the vertical unit. diagrams refer to index numbers computed from the crude rates. We next allowed for changes in age constitution by the following method, which, although not free from objection on theoretical grounds, has