The histogram is used for variables whose values are numerical and measured on an interval scale. It is generally used when dealing with large data sets.A histogram is a table that displays info as adjacent rectangles. Each rectangle is shown over an interval, with an area equal to the frequency of the interval. The height is equal to the frequency density of that interval.
The above image is a histogram that maps the range and variability of slope strikes within a grid model. This typically corresponds to the directions of ridges and valleys. In this example, there is a slight trend at zero degrees (North).
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