A bilateral graph displays two related sets of variables/data through a bar graph, a histogram, a line graph etc. It make sit easier to see and observe more than one set of data at one time. An example of this can be seen above. This graph is a line graph displaying the US trade deficit for each month for the year 2009 and 2010. By using a bilateral line graph, the two sets of data can be compared and trends can be noticed.
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