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Power curves of p-values obtained from the power simulations. Setting 4 (left) tests H0 : β1 = 0. Setting 5 (right) tests . A horizontal dashed line is shown at 0.05. p-values were obtained using Wald (red), likelihood ratio (green), parametric bootstrap Wald (blue) and parametric bootstrap likelihood ratio (purple) tests. Sample sizes used were 10 (dashed), 30 (dotted) and 100 (solid).
