Permutation-based tests for discontinuities in event studies

Federico A. Bugni*, Jia Li, Qiyuan Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We propose using a permutation test to detect discontinuities in an underlying economic model at a known cutoff point. Relative to the existing literature, we show that this test is well suited for event studies based on time-series data. The test statistic measures the distance between the empirical distribution functions of observed data in two local subsamples on the two sides of the cutoff. Critical values are computed via a standard permutation algorithm. Under a high-level condition that the observed data can be coupled by a collection of conditionally independent variables, we establish the asymptotic validity of the permutation test, allowing the sizes of the local subsamples to be either be fixed or grow to infinity. In the latter case, we also establish that the permutation test is consistent. We demonstrate that our high-level condition can be verified in a broad range of problems in the infill asymptotic time-series setting, which justifies using the permutation test to detect jumps in economic variables such as volatility, trading activity, and liquidity. These potential applications are illustrated in an empirical case study for selected FOMC announcements during the ongoing COVID-19 pandemic.

Original languageEnglish (US)
Pages (from-to)37-70
Number of pages34
JournalQuantitative Economics
Volume14
Issue number1
DOIs
StatePublished - Jan 2023

Keywords

  • C12
  • C14
  • C22
  • C32
  • Event study
  • infill asymptotics
  • jump
  • permutation tests
  • randomization tests
  • semimartingale

ASJC Scopus subject areas

  • Economics and Econometrics

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