Alzheimer Figure 1. Histograms of the number of errors of the random forest classifier using 20 randomly selected signatures with 18 proteins. The arrow indicates the results under the same conditions of the 18-protein signature proposed by Ray et al. doi:10.1371/journal.pone.0003111.g001 Figure 2. Histograms of the number of errors considering the random forest classifier and the 20 randomly selected signatures with 6 proteins. The arrow indicates the results under the same conditions of our 6-protein signature. doi:10.1371/journal.pone.0003111.g002 PLoS ONE | www.plosone.org 4 September 2008 | Volume 3 | Issue 9 | e3111