Statistics of the signal detection efficiency for a transit injection-retrieval experiment of simulated light curves with white noise only. Left panel: box least squares algorithm. Right panel: transit least squares algorithm. Both panels show the results of 10 000 realizations of a 3 yr light curve with white noise only (open histograms) and of the same amount of light curves with white noise and an Earth-like planetary transit around a G2V star (gray histograms). Outlined histograms relate to the SDE maximum value in a noise-only search. Gray histograms refer to the highest SDE value within 1% of the period of the injected transit. The SDE thresholds at which the false positive rates are 1% is found to be SDE_fp = 1% = 7. At this SDE threshold, the recovery rate of the injected signals (the true positive rate) is 75.7% for BLS and 93.1% for TLS, while the fraction of missed signals (the false negative rate) is 24.3% for BLS and 6.9% for TLS.