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_Kupper_
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A bar chart is a diagram, presenting comparable data in discrete categories in the form of rectangular bars, that have either their heights or lengths proportional to the represented values. Generally, it consists of two axis. A nominal axis, showing the compared categories and an interval scaled axis, representing the measured value.
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Beside the bar direction which can either be *vertical or horizontal*, two more properties will be distinguished for further considerations. First the diagram orientation, which is either *landscape or portrait* and second the distinction of categories, which can either be done by *axis labels or distinct textures*.
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