GDDM-PGF V2R1.3 Interactive Chart Utility
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Histogram bar - height and area

GDDM-PGF V2R1.3 Interactive Chart Utility
SC33-0328-01
These values, set in panel 1.3, are needed for different types of data. If the steps are of equal length, as they are in the examples above, it is better to use Type 2 (the default) so that the actual values can be read from the y axis.
For example, the following example shows traffic flow, using bar area, which is correct. 





   PICTURE 125           




   Figure 125. Histogram: bar area example
If the steps are of different lengths as they are below, Bar Height can be misleading. There appears to be more traffic in the midday period if you use Bar Height, because the period is longer. Use Bar Area to show low traffic density during the day. 





   PICTURE 126           




   Figure 126. Histogram: bar height example

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