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. Author manuscript; available in PMC: 2008 May 5.
Published in final edited form as: IEEE Trans Med Imaging. 2007 Jul;26(7):954–966. doi: 10.1109/TMI.2007.897396

Fig. 3.

Fig. 3

Family-wise error rates with two covariates: family-wise error rates of the robust test procedure (WB), the permutation method (PM), random field F tests (RF-F), and the χ2 field based on Wn(d) (RF-C) under the linear model (19) with two covariates (Covs) (20). We consider sample sizes of 10, 20, and 40 subjects, four differing correlations, ρ = 0, 0.25, 0.5, and 0.75, and two differing distributions, including homogeneous variance (HMV) and heterogeneous variance (HTV), at the 5% significance level. (a) n = 10, 2 Covs, and HMV; (b) n = 20, 2 Covs, and HMV; (c) n = 40, 2 Covs, and HMV; (d) n = 10, 2 Covs, and HTV; (e) n = 20, 2 Covs, and HTV; (f) n = 40, 2 Covs, and HTV.