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泊松分布验证- 用excel进行数据分析番外

  • 2026-08-10 12:12:27
泊松分布验证- 用excel进行数据分析番外

如何判断正态分布-用excel进行数据分析番外谁说要验证泊松分布的?以下是一种方法,这种方法有种缺陷,分类不能太多,否则验证会有问题。

|| 泊松分布的定义 ||

在做泊松分布验证前,我们先了解下什么是泊松分布,查维基百科,直接摘录其中最重要的概念如下:

泊松分布适合于描述单位时间内随机事件发生的次数的概率分布。如某一服务设施在一定时间内受到的服务请求的次数,电话交换机接到呼叫的次数、汽车站台的候客人数、机器出现的故障数、自然灾害发生的次数、DNA序列的变异数、放射性原子核的衰变数、雷射的光子數分布等等。

泊松分布的函数如下:

泊松分布的参数λ是单位时间(或单位面积)内随机事件的平均发生

从这个函数中看出,泊松分布其实只有一个变量,当确定了λ后,泊松分布就已经确定。

在实际运用中,有人用此分布预测球赛结果,我们物流也可以运用泊松分布预测市场需求;跟正态分布一样,也是非常常用的分布之一,在运用这个分布前,我们如何来验证呢?我怎么知道,我的一堆数据是符合哪个分布的?

对于正态分布的验证有很多方法,对于泊松分布也有很多,通常PythonR等软件都可以非常简单的进行验证,这里对于我们苦逼的物流来说,咱只有excel,怎么利用手头有限的资源,进行验证呢?

先从原理入手,如果我们把数据去比对标准的泊松分布,再求出对应的P,对P进行验证就可以知道,分布是否是泊松分布了。

|| 卡方检验 ||

查看了很多检验的方法,最简单实现而且Excel有现有公式的就是卡方检验(Chi-squaregoodness of fit testing理论上这个测试可以测试任何分布,(当然我没有尝试过,有兴趣的可以试一下)

卡方检验的原理:卡方检验可用于检验观察数据遵循特定条件的假设分配。测试程序包括在样本中安排n个观察值进入具有k个类别的频率表。卡方统计量为:

自由度数为k −p − 1,可以通过查表得出P,再对比P是否小于0.05来验证是否是泊松分布,同理这个检验可以用于其他分布,比如正态分布。

看原理,估计看得稀里糊涂,咱用下面的实际案例来看下,如果运用这个检测方法去验证泊松分布:

因为泊松分布是对次数的概率统计,所以,你先要检测你的统计是否符合这个标准,然后,我们再对数据进行分不同的维度和自由度进行统计分析,这里的案例只举了一个维度。

方法一:

我们先用excel的自带功能生成100个泊松分布的随机数。然后根据上面的公式进行分析计算得出相关的X^2和,再进行查表进行找到P

方法二:

可以直接运用excelPOISSON.DISTCHISQ.TEST直接得出P值。

下面的录像中,我会具体介绍如何实现,并比对正态分布的的数据进行分析验证。

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录像中有点需要纠正,自由的K-2,那个K是X的数量,这里计数错了,应该是7个,不是6个。

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  1. CONNECT:[ UseTime:0.001077s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001417s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000692s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000676s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001284s ]
  6. SELECT * FROM `set` [ RunTime:0.000585s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001464s ]
  8. SELECT * FROM `article` WHERE `id` = 546479 LIMIT 1 [ RunTime:0.005070s ]
  9. UPDATE `article` SET `lasttime` = 1786424198 WHERE `id` = 546479 [ RunTime:0.003011s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.003101s ]
  11. SELECT * FROM `article` WHERE `id` < 546479 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001100s ]
  12. SELECT * FROM `article` WHERE `id` > 546479 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001087s ]
  13. SELECT * FROM `article` WHERE `id` < 546479 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002297s ]
  14. SELECT * FROM `article` WHERE `id` < 546479 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.013018s ]
  15. SELECT * FROM `article` WHERE `id` < 546479 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003351s ]
0.203972s