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Engineering News-Record. March 20. 1919.

Distribution of Annual Run-off of Seven New England Rivers in a 12-Months' Period.

The method of reading this curve chart is as follows: at the end of six months, or 50% of the time period, there had been 82% of the total annual run-off of the St. John River. If the distribution was the same for every month, at the end of six months 50% only would have run off.

REFERENCES:

Lorenz, M. O., "Methods of Measuring the Concentration of Wealth," Publications of the American Statistical Association, Vol. IX, 1905. This issue of the Journal is so limited that the American Statistical Association cannot sell it. However, it is available in most libraries.

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