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Examples of how the number of samples affects the p-values reported by the permutation methods P and R and by the autocorrelation method A. In both figures, each separate curve corresponds to a standard sine wave at interval [0, 4π], with noise added so that the sine signal accounts for 5%, 10%, ..., 100% of the total signal energy. The slight bumps in the curves for method A correspond to the cosine in the denominator of Equation (4).
