Only 35% percent of the accounts have their gender listed in a linked Google+ account. Checking someone&#x27;s social media profile is a relatively sure way of automatically determining the gender of a lot of people. The authors did use another automated tool to see if they could figure out the gender of users from their Github profile as well, which is something they needed for the second part of their analysis. They don&#x27;t specify how accurate that procedure was, so it&#x27;s possible that they are more accurate than you think.<p>Of course, there is still the issue that they have effectively limited their sample to people with Google+ accounts which may affect the results of the study. Given that men&#x27;s acceptance rate also dropped when their gender was identifiable (but not by as much) gives credence to the idea that there might be a flaw in their Github profile analyzer.