Take every paper apart
A study is not one number. A single paper might test four different mail pieces on three different kinds of voter, and the headline figure is an average of things that behave nothing alike. Our objective was not 'does mail work' but when does mail work? When? For what kind of campaign? And in what type of election cycle? To get there, we break down every individual tactic of every experiment, separately, with the conditions it ran under. The result is an information map indexed on dozens of tactics across hundreds of papers.
distinct tactic experiment arms
Every arm is tagged the same way: what tactic, which channel, what kind of election, how loud the race was, which voters, how long before election day. That's what makes two studies comparable — or proves that they aren't.