Supply Chain Concepts

histogram

Major Topic Area: quality concepts

Histograms are a graphical tool utilized to understand the variability of a dataset. The vertical (y) axis of a histogram is always the number of occurrences. The horizontal (x) axis is a number of subdivisions representing the range of values of the dataset. For example, you may wish to create a histogram of the daily high temperatures in a location. The temperature dataset is summarized in the following table.

Number of occurrences (days)	Temperature Range (ºC)
1	15.0-17.0
1	17.1-19.0
2	19.1-21.0
7	21.1-23.0
16	23.1-25.0
3	25.1-27.0
1	27.1-29.0

The corresponding histogram would have the following appearance:

 

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