Figure 1

For a comparison of the HapMap samples ROC curves are presented to assess the performance of a single probe/probe-set for distinguishing the log-ratios associated with differing copy numbers from the log-ratios of chromosome 13 where copy-numbers should agree. Note the contrast from the left-hand panel, where the performances of Affymetrix and Agilent are indistinguishable, and the right hand panel, where the performance of Affymetrix has substantially declined.