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读了贵刊1986年第8期“中小学实用统计讲座”题下的三篇文章,觉得其中对于差异系数的论述不尽妥当.现在,我也来说说应该如何理解差异系数的意义. 人们曾经只用集中量(算术平均数??最常用)来描述一组数据,但很快就发现,两组算术平均数相同的数据的频数分布并不完全一致,仅用集中量是不够的,于是用差异量(标准差S最常用)来表示数据的离散情况,辅助集中量对数据的描述.但是,标准差(绝对差异量)对两种单位不同或单位相同而两个平均数相差较大的数据都不能直接比较差异的大小,于是产生了差异系数(相
I read your article entitled “Practical Statistics Lecture on Primary and Secondary Schools”, 1986, No. 8, in which I did not elaborate on the difference coefficient, and now I will also say how to understand the significance of the difference coefficient. Once used to describe a set of data using only the concentration (arithmetic average), but it was soon discovered that the frequency distribution of the two data sets with the same arithmetic mean was not exactly the same. Concentration alone was not enough, Therefore, the discrepancy (standard deviation S is the most commonly used) is used to represent the discretization of the data and to assist the description of the data. However, the standard deviation (absolute discrepancy) is different for both units or units and the two averages are different Large data can not be directly compared the size of the difference, then produced a difference coefficient (phase