Simulated power analyses for observational studies: An application to the affordable care act medicaid expansion

• 成果类型: Article
• 署名作者: Black, Bernard; Hollingsworth, Alex; Nunes, Leticia; Simon, Kosali
• 署名单位: Northwestern University; Northwestern University; Indiana University System; Indiana University Bloomington; National Bureau of Economic Research; Insper
• 刊物名称: JOURNAL OF PUBLIC ECONOMICS
• ISSN/ISSBN: 0047-2727
• DOI: 10.1016/j.jpubeco.2022.104713
• 发表日期: 2022
• 关键词: Simulated power analysis; health insurance; mortality; Medicaid expansion

摘要

Power is an important factor in assessing the likely validity of a statistical estimate. An analysis with low power is unlikely to produce convincing evidence of a treatment effect even when one exists. Of greater concern, a statistically significant estimate from a low-powered analysis is likely to misstate the true effect size, including finding estimates of the wrong sign or that are several times too large. Yet statistical power is rarely reported in published economics work. This is in part because many modern research designs are complex enough that power cannot be easily ascertained using simple formulae. Power can also be difficult to estimate in observational settings. Using an applied example-the link between gaining health insurance and mortality-we conduct a simulated power analysis to outline the importance of power and ways to estimate power in complex research settings. We find that standard difference -in-differences and triple differences analyses of Medicaid expansions using county or state mortality data would need to induce reductions in population mortality of at least 2% to be well powered. While there is no single, correct method for conducting a simulated power analysis, our manuscript outlines how applied researchers can conduct simulations appropriate to their settings.(c) 2022 Published by Elsevier B.V.