From there, FadeMeBets analyzes players’ metrics over their history in the WNBA and even in college. He tracks players’ stats over the course of a 24- to 38-day menstrual cycle, looking for dips and surges over the monthlong cycle. If someone is missing a lot of baskets at a certain time every month, he might assume they’re on their late luteal phase, citing a study that showed menstruating athletes self-reported worse performance during this time. He hasn’t asked any players directly about their cycles.