ROC Curve in Excel (Receiving Operating Characteristic)
Use a ROC Curve to choose the most appropriate "cut-off" for a test.
QI Macros Add-in for Excel Contains a ROC Curve Template
Click on the QI Macros Menu and select, Chart Templates, ROC Curve.
- Input the Cut Points in column A.
- Input the number of normal and non-normal cases in columns B and C, respectively.
- The template will perform the calculations and draw the ROC Curve.
- The template will also calculate the area under the curve (C14) and rate the accuracy of the test (C17).
- > .9 = Excellent
- > .8 = Good
- > .7 = Fair
- ≤ .7 = Poor
For a comprehensive description of ROC Curves see http://gim.unmc.edu/dxtests/ROC1.htm