2.3: 频率分布的构建

Construction of Frequency Distribution
JoVE Core
Statistics
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JoVE Core Statistics
Construction of Frequency Distribution

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01:15 min
April 30, 2023

Overview

A frequency distribution table can be constructed using the steps given below.

First, make a table with two columns—one with the title of the data that needs to be organized, and the other column for frequency. [Draw a third column for tally marks if needed]. Then, take a look at the items given in the data set and decide if an ungrouped frequency distribution table or a grouped frequency distribution table would be more suitable. If there are large sets of different values, then it is best to construct a grouped frequency distribution table. Now, write the data set values in the first column. Count the number of times each item repeats itself in the collected data. In other words, find the frequency of each item by counting, followed by writing the frequency in the second column corresponding to each item. Finally, write the total frequency in the last row of the table.

Transcript

考虑参加马拉松比赛的参与者。假设人们想知道参与者的数量如何随年龄而变化。为了找出答案,使用频率分布表对数据进行汇总,该表由六个步骤构建。

首先,根据数据密度,选择类的数量,介于 5 到 20 之间的任意值。在这里,让类的数量为 5。

从最大数字中减去最小值以确定范围。将此范围除以类数得到类宽度,即每个类的值范围,为方便起见,该范围向上舍入。

给定数据的最小值称为第一个下限。

对于此值,请添加类 width 以确定第二个下限类限制。同样,计算后续的下限。

接下来,从第二个下限中减去 1 以计算第一个上限。同样,计算剩余的上限。

在第二列中,为每个班级下的参与者放置计数标记。所有计数标记的总和给出了每个类的频率。

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