Publisher's Synopsis
Excerpt from Schs Statistical Primer, 1982, Vol. 1
The conclusion from these ideas-we must hold it in mind always when looking at logarithmic plots-is that equal distances on a logarithmic scale represent equal percentage changes, whereas equal distances on an arithmetic scale represent equal numerical changes. And a corollary of this conclusion is that equal slopes (or degrees of slant) on two logarithmic plots indicate equal rates of percentage change. Applying these generalizations in Figure 2, we see that for disease C the mortality rate dropped 50% between 1900 and 1912, then halved itself again between 1912 and 1918. (three dots are placed on the plot for disease C so that the reader may project them to the axes and verify the preceding sentence.) For disease B the mortality rate dropped 50% between 1900 and about 1922; but as of 1938, when the study of disease 8 ended, the halving had not been repeated. (the two dots on the plot for disease 8 should be projected to the axes exactly as were the three dots for disease C.) Comparing the general downward slopes of the two plots, we see that the rate of percentage change in mortality from disease B is less than the rate of percentage change in mortality from disease C.
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