Your PDF has successfully downloaded.
You may be interested in finding more content on these topics:
You are not currently logged in.
Access JSTOR through your library or other institution:
Records of Health and Sanitary Progress
Robert E. Chaddock
Publications of the American Statistical Association
Vol. 14, No. 108 (Dec., 1914), pp. 319-334
Stable URL: http://www.jstor.org/stable/2965022
Page Count: 16