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Panel Conditioning Biases in the Current Population Survey's Food Security Supplement.

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Panel conditioning significantly biases food insecurity estimates. Repeated survey participation makes individuals appear less food insecure, potentially under- or overestimating the true prevalence in the United States.

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Area of Science:

  • Social Sciences
  • Economics
  • Public Health

Background:

  • The Current Population Survey's Food Security Supplement (CPS-FSS) is the primary source for U.S. federal food insecurity statistics.
  • Panel conditioning, a methodological issue, may bias survey estimates when respondents participate over time.

Purpose of the Study:

  • To quantify the bias introduced by panel conditioning in U.S. food insecurity prevalence estimates.
  • To assess the impact of repeated survey participation on reported food security status.

Main Methods:

  • Utilized 2002-2020 CPS-FSS data, leveraging its rotating panel design.
  • Employed a quasi-experimental approach comparing respondents with staggered entry into the survey to isolate panel conditioning effects.
  • Analyzed data from over 200,000 unique households, controlling for attrition bias.

Main Results:

  • Respondents who previously participated in the CPS-FSS were significantly less likely to be classified as food insecure compared to first-time respondents.
  • These differences were statistically significant and substantial in magnitude across most years.
  • Evidence suggests a consistent effect of panel conditioning on reported food security.

Conclusions:

  • Federal government estimates of food insecurity prevalence in the U.S. are substantially biased due to panel conditioning.
  • The direction and magnitude of the true food insecurity prevalence may differ significantly from official reports.
  • Further research is needed to understand the mechanisms driving panel conditioning and refine estimation methods.