Cumulative Frequency Plot

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Cumulative frequency graphs have two main options - how the frequencies are shown and whether to show the dots.

 

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Show Frequencies As

 

The cumulative frequency graph can show frequencies as absolute, relative or as percentages.  For example, if we have 20 data points ranging from 5 to 15, the graph could look like:

 

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Absolute                                  Percentage                                         Relative

 

The only difference between the graphs is how the y axis is displayed.

 

Percentage frequencies and relative frequencies are most useful when comparing data sets which have different numbers of scores.

 

 

Show Dots

 

You can choose to show a dot for each data point or to just show the line.  Show dots is usually only useful for small number of data points.

 

If you use transparent shading for your data points, the colour of the shading of the dots indicates how many data points had that value.

 

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In the example, the point on the left was shaded twice (for two data points) and the point on the right has only been shaded once.