A GENERAL NOMOGRAPH FOR NORMAL AND SKEWED FREQUENCY DISTRIBUTIONS: CLIMATOLOGICAL AND OTHER APPLICATIONS
ARMY NATICK LABS MA EARTH SCIENCES LAB
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Extended experience in the construction and use of several different predictive nomographs covering a wide range of frequency distributions of various types of weather and other phenomena, suggested the probability that a universal series of patterns of frequency distributions might permeate the whole of nature. This study is based in part on the several nomographic patterns developed in previous studies. It assumes that all of the frequency distributions we are likely to encounter in practical climatology, whether symmetrical or asymmetrical skewed, may be fairly well approximated by a family of cumulative frequency curves, provided they are plotted on such a scale that 100 units represents the whole range of observational experience in each. The predictive patterns in the General Nomograph and its associated table depend for their operation on the numerical position of the mean average between the two extremes maximum and minimum in the frequency distribution, when the three related measures are reduced to a 100-unit scale. The means of frequency distributions having various degrees of skewness lie along a diagonal line from the lower left to the upper right of the basic section of the nomograph. Other lines curved trace the values of other percentile or fractional parts of the various distributions. The construction, use and reliability of this nomograph and its associated table are given in this report.