arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1206.6367stat.MEmath.STstat.TH
收藏

离散Kolmogorov-Smirnov统计量与欧氏距离的比较

A comparison of the discrete Kolmogorov-Smirnov statistic and the Euclidean distance

Jacob Carruth, Mark Tygert, Rachel Ward

摘要:

拟合优度检验衡量给定的一组观测值是否一致(达到预期的随机波动),并作为独立同分布(i.i.d.)从称为“模型”的用户指定的概率分布中提取。“标准计量器涉及模型与观察到的绘制的经验分布之间的差异。有些差异的衡量标准是累积的,有些则不是。最流行的累积度量是Kolmogorov-Smirnov统计量;当考虑的所有概率分布都是离散的时,一个自然的非累积度量是模型和经验分布之间的欧几里得距离。在本文中,数学分析及其通过各种数据集的说明都表明,当绘图可以采用的值具有自然顺序时,Kolmogorov-Smirnov统计往往比欧几里得距离更强大-也就是说,当数据是有序的--而欧几里得距离比柯尔莫哥洛夫距离更可靠,更容易理解,Smirnov统计量,当没有自然排序(或偏序)时,即当数据是名义型的。

英文摘要:

Goodness-of-fit tests gauge whether a given set of observations is consistent (up to expected random fluctuations) with arising as independent and identically distributed (i.i.d.) draws from a user-specified probability distribution known as the "model." The standard gauges involve the discrepancy between the model and the empirical distribution of the observed draws. Some measures of discrepancy are cumulative; others are not. The most popular cumulative measure is the Kolmogorov-Smirnov statistic; when all probability distributions under consideration are discrete, a natural noncumulative measure is the Euclidean distance between the model and the empirical distributions. In the present paper, both mathematical analysis and its illustration via various data sets indicate that the Kolmogorov-Smirnov statistic tends to be more powerful than the Euclidean distance when there is a natural ordering for the values that the draws can take -- that is, when the data is ordinal -- whereas the Euclidean distance is more reliable and more easily understood than the Kolmogorov-Smirnov statistic when there is no natural ordering (or partial order) -- that is, when the data is nominal.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑