This application investigates the spatial relationship between nitrate levels and cancer rates in Wisconsin. Nitrate levels are measured as part of well water quality tests. Cancer occurrences were catalogued over a ten year period.
Set the IDW interpolation distance decay coefficient k. A high value means closer neighbors will have more importance. Values should be greater than 1.
The regression results layer shows the output of a linear regression between the interpolated nitrate values and the cancer rates. The residual shows where the regression results were higher or lower than actual cancer rates.