FIG. 7.

FPRs from the ETAC method, with the Beijing subset of FCON-1000. See Figure 1 for description of labels, but note that the y-axis range has been changed here for visual clarity. Three p value thresholds (0.005, 0.002, 0.001) are used simultaneously, and p-specific spatially variable cluster-size threshold maps are created from sign-randomized (and intersample permuted for the two-sample cases) simulations. For each of the 16 cases, 1000 random subsets of 40 subjects were selected, and a two-sample t-test was run between the first 20 and second 20 data sets for each of the 1000 instances. As labeled in each panel caption, results were calculated using either NN = 1 or NN = 2 neighborhoods (see Results section: The future, II: Equitable thresholding and clustering) to define the clusters, and either one-sided or two-sided t-testing to define the p value thresholding. All FPRs fall within the 95% nominal confidence interval; error bars show the 95% confidence interval estimated for each result. FPRs from the Cambridge subset of the FCON-1000 (also 198 subjects) yielded similar results. ETAC, equitable thresholding and clustering.