http://waterwatch.usgs.gov/regplots/real/real_or_2.gif
This is a Index Value Plot which takes the index value of a variable and plots it to see if there are any discrepancies. It also shows whether there was a positive or negative change in the index value. This plot shows the rainfall recorded in inches in Oregon from 1999 until 2006. Four inches is the normal rainfall for the area and is the base number.
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