Whatever the difference is between Redfin buyers and non Redfin buyers it obviously might be statisically relevant. I'd like to see the comparison for purchase

Whatever the difference is between Redfin buyers and non Redfin buyers it obviously might be statisically relevant. I'd like to see the comparison for purchases where the users considered using Redfin but ultimately went the traditional way instead and users who used Redfin. It will have less selection bias.