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Summarizing and Visualizing Data

Cumulative Frequency Graph for Medians

Description

An ogive graph is a cumulative frequency graph used in statistics. It is also called a cumulative frequency polygon. Instead of showing each class on its own, it adds the cumulative percentages from left to right.

An ogive graph plots cumulative frequency on the vertical y-axis and class boundari...

Transcript

累积频率可以通过Ogive图进行可视化表示。其中,X轴表示组限,Y轴表示累积频率。 

例如,考虑一个关于购买不同价格区间相机的顾客的频数表。请注意,表中列出了用于划分各类别且无间隙的组界。

为了确定购买价格低于 80 美元相机的顾客数量,需计算小于 80 的组别的累积频数。该值等于当前组别及其之前所有组别频数的总和。同理,可依次计算其余各组的累积频数。

在该图中,由连续线连接的每个点表示相应类别边界以下的累积频率。例如,有10位顾客购买的相机价格低于79.5美元,而18位顾客购买的相机价格低于99.5美元。

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