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

Bernard Black, Alex Hollingsworth*, Letícia Nunes, Kosali Simon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number104713
JournalJournal of Public Economics
Volume213
DOIs
StatePublished - Sep 2022

Keywords

  • Health insurance
  • Medicaid expansion
  • Mortality
  • Simulated power analysis

ASJC Scopus subject areas

  • Finance
  • Economics and Econometrics

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