http://en.wikipedia.org/wiki/File:Travel_time_histogram_total_n_Stata.png
In its simplest form, a histogram is a graphical representation of a distribution of data. A histogram consists of tabular frequencies, shown as side-by-side rectangles, displayed over a range of intervals. The intervals are usually ranges (as previously stated), generally the same size, and must be adjacent. Histograms are most often used to plot density of data.
The histogram above shows the United States' 2000 census of travel time.
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