Conditional entropy’s results across a range of frequencies for a sinusoidal light curve with 100 observations, a baseline magnitude of 17, and an amplitude of 0.1 (S/N = 14.3). The plot on the left shows the frequency range searched, and the inset at the minimum entropy shows the noisy behaviour of the estimator. The estimated best frequency and its uncertainty are shown with a black error bar. The plot on the right shows the light curve folded at the found frequency.