Graphs can be Bilateral, based upon two data series, in order to compare two related variables. Bilateral Graphs can be of varying types, including bar and line. Often in bilateral bar graphs one data series is measured up or to the right, while the other is measured downwards or to the left. Bilateral graphs can show negative and are frequently used to represent how an increase in one data series cause either a decline in another or an accompanying rise. The bilateral line graph above shows the relationship between gas prices and consumer spending in the US for most of 2007.
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