2.9: 相对频率直方图

Relative Frequency Histogram
JoVE Core
Statistics
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JoVE Core Statistics
Relative Frequency Histogram

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01:14 min
April 30, 2023

Overview

The relative frequency depicts the proportion of data points that have each value. The frequency tells the number of data points that have each value. Like the histogram, a relative frequency histogram also has the same shape with a horizontal scale (the x-axis), but the vertical scale (the y-axis) is marked with relative frequencies (percentages of the whole) instead of actual frequencies. A relative frequency histogram is a graphical representation of a frequency distribution where the heights of rectangle bars indicate the frequency with data falling into the associated classes, while the bar's width and position indicate the various classes. Frequency histograms must be labeled with either class midpoints or with class boundaries. The purpose of this graph is to check the distribution of data.

Transcript

考虑一个相对频率分布表,其中以 class intervals 和 class boundaries 表示为不同价格范围的 clocks 数量。此表表示数据集中每个定量值的相对比例。

此类相对频率表使用称为相对频率直方图的图表进行可视化。在这里,纵轴表示每个类的相对频率,横轴表示类边界或类中点。

然后,绘制等宽的垂直条,没有间隙,将类边界与相对频率值连接起来。从这些直方图中,可以了解任何值相对于数据集中其他值出现的频率。

假设数据以百分比频率表示;然后使用百分比频率直方图对数据进行可视化。在这里,第二个 bin 显示 17% 的时钟总销量在 10.5 到 16.5 美元之间。

如果数据集太大,将它们绘制在直方图上更容易解释。

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