Can't tell if you excluded startups where the founder had a previous successful startup (solo or otherwise) but it doesn't look like it? I think this would mas

Can't tell if you excluded startups where the founder had a previous successful startup (solo or otherwise) but it doesn't look like it? I think this would massively distort your results. Founders with a history of success are vastly more likely to succeed in a new venture for numerous reasons, but most people who are interested in these stats (both founders and investors) are interested in the pre-big-win founder case. Also, I suspect far more 'startups' have a single founder, purely because it's so incredibly easy to 'start' something alone. Having a cofounder implies a certain level of organization and commitment - it doesn't really work with that pet project you dabble with occasionally. If solo dabblers far outnumber 'team' dabblers then you'd expect them to be over represented in successes even if their success rate was much lower.