III. Contributions to the mathematical theory of evolution
III. Contributions to the mathematical theory of evolution
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DOI：
10.1098/rspl.1893.0079
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发表时间：
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通讯作者：
K. Pearson
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文献类型：
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作者：
K. Pearson
1. 如果不是针对同一对象，而是针对一组相同类型或系列的对象进行一系列物理、生物、人类学或经济测量，并通过绘制测量值落入给定范围小单位内的次数来构建一条曲线，则该曲线可称为频率曲线。通常，该频率曲线采用众所周知的误差曲线形式，并且这样的曲线可以被称为正常频率曲线。后一条曲线关于其最大纵坐标对称。然而，有时频率曲线不采用正常形式，因此通常但不一定是不对称的。
1. If a series of measurements, physical, biological, anthropological, or economical, not of the same object, but of a group of objects of the same type or family, be made, and a curve be constructed by plotting up the number of times the measurements fall within a given small unit of range to the range, this curve may be termed a frequency curve. As a rule this frequency curve takes the well known form of the curve of errors, and such a curve may be termed a normal frequency curve. The latter curve is symmetrical about its maximum ordinate. Occasionally, however, frequency curves do not take the normal form, and are then generally, but not necessarily, asymmetrical.