The repeatability of an association study as a function of 4Nc, the percentage of variation attributable to a QTN, and the number of individuals examined. Repeatability is defined as the probability of a second association study being significant at P < 0.05 using the HMP statistic given an initial association study was also significant at P < 0.05. Dotted, dashed, and solid lines represent 2.5%, 5.0%, and 10.0% of the total variation attributable to the QTN, respectively. The top panel is for 100 typed individuals; the bottom panel is for 500 typed individuals. Plotted data are over all realizations of the coalescent, where >4 and <20 SNPs, were typed.