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A histogram is a graphical representation of the frequencies of a continuous variable. The variable is divided into bins and a bar is drawn for each bin, proportional to its frequency in the data.

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How to assess the similarity of two histograms?

Don't forget to divide the bar heights by the sum of all observations of each histogram. … If translation of the histogram along the x-axis is not meaningful in your application, you may want to subtract the mean from each histogram first. …
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