Index value plot

An index value plot represents information that happens over time. This plot is showing the viewer average stream flow from 2001-2008. The data spread over the normal line, shows the viewer that the stream flow has been quite average with a few ups and downs.

Image found at: https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjB1kCmTtp-uO9q2SN7l2y4WvgKSJqyUWldn0wrg1adjRd4KAZQNmGS6uCLV-EiOhyawsVTxAqaoNPPgp2XPhfugqyga5XCojImo3w0yWq7sODofm4VaBs_wURaoXOHQ9GIEQuvc7yLZ-Y/s320/index+value+plot.gif