Reference Intervals: A User’s Guide. Paul S. Horn and Amadeo J. Pesce. Washington, DC: AACC Press, 2005, 115 pp., $61.00 ($49.00 AACC members), softcover (CD-ROM included). ISBN 1-59425-035-9.

to reproduce the 2 summary ROC curves that appear in Fig. 1 of our article without too much further difficulty.This is an example of how the intermediate calculations worksheets provided me valuable assistance.In summary, for Excel users who wish to combine and analyze the results of multiple independent studies of a test's diagnostic accuracy, dr-ROC provides a reasonably simple and flexible way to estimate and plot a summary ROC curve along with many related statistics.However, given its limited scope, the price of the software may seem a bit high to some potential users.