Researchers Propose SplitGraph Design For Spillovers

At a Harvard Data Science Initiative seminar, Panos Toulis and collaborators present a network-aware "SplitGraph" experimental design and Fisher randomization-based analysis to improve power for estimating spillover effects in interconnected settings. They apply the approach to a tax audit experiment covering roughly 0.5 million firms and 8.7 million transactions, highlighting a tuning parameter that prioritizes direct versus spillover estimands.