A bilateral graph portrays the comparison of two related variables. The graph can display positive and negative data. The chart can be displayed as a curve, line, or bar graph. The bilateral bar graph picture above shows the Profit- and Dividend Status of 348 Corporations in the United States for the period from 1929 to 1935.
http://www.scribd.com/doc/53502496/5/BILATERAL-BAR-CHARTS
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