Efficiently Learning Synthetic Control Models for High-dimensional Disaggregated Data

• URL: http://arxiv.org/abs/2510.22828v1
• Date: Sun, 26 Oct 2025 20:43:52 GMT
• Title: Efficiently Learning Synthetic Control Models for High-dimensional Disaggregated Data
• Authors: Ye Shen, Rui Song, Alberto Abadie,
• Abstract summary: The Synthetic Control method has become a valuable tool for estimating causal effects.<n>It has recently found applications in high-dimensional disaggregated settings with multiple treated units.<n>We propose a novel approach that integrates the Multivariate Square-root Lasso method into the synthetic control framework.
• Score: 6.075160426378313
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The Synthetic Control method (SC) has become a valuable tool for estimating causal effects. Originally designed for single-treated unit scenarios, it has recently found applications in high-dimensional disaggregated settings with multiple treated units. However, challenges in practical implementation and computational efficiency arise in such scenarios. To tackle these challenges, we propose a novel approach that integrates the Multivariate Square-root Lasso method into the synthetic control framework. We rigorously establish the estimation error bounds for fitting the Synthetic Control weights using Multivariate Square-root Lasso, accommodating high-dimensionality and time series dependencies. Additionally, we quantify the estimation error for the Average Treatment Effect on the Treated (ATT). Through simulation studies, we demonstrate that our method offers superior computational efficiency without compromising estimation accuracy. We apply our method to assess the causal impact of COVID-19 Stay-at-Home Orders on the monthly unemployment rate in the United States at the county level.

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