Figure 2
From: Randomization techniques for assessing the significance of gene periodicity results
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, 4Ï€], 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).