Statistics 简明教程

Statistics - Histograms

直方图是数值数据分布的图形表示。它是连续变量(定量变量)的概率分布的估计值。

A histogram is a graphical representation of the distribution of numerical data. It is an estimate of the probability distribution of a continuous variable (quantitative variable).

Problem Statement:

Problem Statement:

每个月记录一只狗的体重增加多少,并得到以下结果:

Every month one measure the amount of weight one’s dog has picked up and get these outcomes:

0.5

0.5

0.3

-0.2

1.6

0

0.1

0.1

0.6

0.4

绘制直方图,显示这只狗的发育情况。

Draw the histogram demonstrating how much is that dog developing.

Solution:

Solution:

每月的发育从 -0.2 (表示这个月瘦了)到 1.6。将它们从最低增重到最高增重排序。

monthly development vary from -0.2 (the fox lost weight that month) to 1.6. Putting them in order from lowest to highest weight gain.

-0.2

0

0.1

0.1

0.3

0.4

0.5

0.5

0.6

1.6

我们决定将结果按 0.5 分组:

We decide to put the results into groups of 0.5:

  1. The -0.5 to just below 0 range.

  2. The 0 to just below 0.5 range, etc.

以下是结果:

And here is the result:

histogram

1 到略低于 1.5 没有值,但我们仍然显示该空间。

There are no values from 1 to just below 1.5, but we still show the space.