“…Opt-in panels are growing in popularity throughout the social sciences because of their low cost, and because they mitigate the inadequate response rates and coverage issues that plague more traditional methods of survey administration, such as random digit dialing and mailings (Ansolabehere and Rivers, 2013;Rivers, 2006Rivers, , 2007Vavreck and Rivers, 2008). Such panels have been used to examine public attitudes on issues related to crime and criminal justice (e.g., Harris and Socia, 2014;Mancini and Pickett, 2016;Pickett, Loughran, and Bushway, 2016), psychology (e.g., Blodorn and O'Brien, 2013;Dainton, 2015), and many other fields (for an excellent overview of opt-in panel designs, see Thielo, 2017). Because panel members are required to provide certain basic social and demographic information, the representativeness of a sample to the population of interest can be ascertained.…”