The theoretical single-search false alarm rate as a function of detection threshold for the Kepler mission from Jenkins et al. (2002; solid blue line). A dashed blue line indicates the desired false positive rate of 1/100,000 for Kepler, which is achieved at a detection threshold of 7.1σ. A dashed orange line shows an estimate for the Roman survey, where a false positive rate of 1/200,000,000 is achieved at a detection threshold of 8.1σ.