CALCULATOR PROGRAM FOR NORMAL AND LOG-NORMAL DISTRIBUTIONS.

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作者：
Chapin, Jack F.
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来源：
Chemical Engineering (New York) | 1980年 / 87卷 / 25期
关键词：
PARTICLE SIZE DISTRIBUTION;
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摘要：
A normal distribution of values falls along a bell-shaped curve, as shown in Fig. 1. If the ordinate is converted from frequency to cumulative-percent-less-than (CPLT), the result is as shown in Fig. 2. And if this ordinate is plotted on a probability scale, the result is a straight line, as shown in Fig. 3. If distribution data fall in a straight line on arithmetic-probability or logarithmic-probability graph paper, this program can calculate the least-squares equation of best fit, and also the correlation coefficient, which measures the goodness of fit. A common example of a log normal distribution (for which this program is written) is the frequency of particle sizes obtained in size reduction operations. The program and its running are described in some detail, and comments on program routines are included.
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页码：75 / 78
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