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Alexander Coppock’s indexed work centers on the validity and generalizability of survey experiments, particularly those conducted on online convenience samples. His most-cited first-author paper systematically validated results from a new online survey platform, demonstrating that demographic, political, and psychological findings replicated well. He further examined the generalizability of treatment effect estimates across samples, showing that heterogeneous effects from Mechanical Turk experiments often replicated in nationally representative surveys. In a related vein, his senior-authored work on the small effects of political advertising synthesized evidence from 59 real-time randomized experiments, concluding that ad effects were consistently small regardless of context, message, or sender. Beyond his lead-author contributions, Coppock co-authored a major methodological synthesis on sensitivity bias in list experiments, analyzing 30 years of data to develop a social reference theory that explains when such bias arises. His research arc consistently interrogates the external validity of experimental findings, from early work on whether voting is habit-forming to later studies on the long-lasting effects of newspaper op-eds and the generalizability of COVID-19-era online experiments. Across these projects, Coppock has advanced a rigorous, replication-focused approach to political science experimentation.
Alexander Coppock, Oliver McClellan
Alexander Coppock
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Alexander Coppock, Thomas J Leeper, Kevin J Mullinix
Graeme Blair, Alexander Coppock, Margaret Moor
Alexander Coppock, Seth J Hill, Lynn Vavreck