A line graph is a type of geovisualization. The graph is used to compare an independent variable verses a dependent variable. The dependent variable is usually time. Line graphs can consist of one or more lines. Data from an experiment is plotted on the graph, and a line is used to connect the data to show a trend. A line graph is an extension of a scatter plot and has many similar characteristics. The picture above shows a line graph of the amount of people who switch from AT&T to MCI over a period of time. The trend shows a positive correlation between time and number of people who switched companies.
http://mste.illinois.edu/courses/ci330ms/youtsey/lineinfo.html
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