Using design effects from previous cluster surveys to guide sample size calculation in emergency settings

Reinhard Kaiser, Bradley A. Woodruff, Oleg Bilukha, Paul B. Spiegel, Peter Salama

Research output: Contribution to journalReview articlepeer-review

Abstract

A good estimate of the design effect is critical for calculating the most efficient sample size for cluster surveys. We reviewed the design effects for seven nutrition and health outcomes from nine population-based cluster surveys conducted in emergency settings. Most of the design effects for outcomes in children, and one-half of the design effects for crude mortality, were below two. A reassessment of mortality data from Kosovo and Badghis, Afghanistan revealed that, given the same number of clusters, changing sample size had a relatively small impact on the precision of the estimate of mortality. We concluded that, in most surveys, assuming a design effect of 1.5 for acute malnutrition in children and two or less for crude mortality would produce a more efficient sample size. In addition, enhancing the sample size in cluster surveys without increasing the number of clusters may not result in substantial improvements in precision.

Original languageEnglish (US)
Pages (from-to)199-211
Number of pages13
JournalEconomic Outlook
Volume30
Issue number2
DOIs
StatePublished - Apr 2006
Externally publishedYes

Keywords

  • Cluster surveys
  • Cross-sectional studies
  • Heterogeneity
  • Mortality
  • Nutrition surveys
  • Sample size

ASJC Scopus subject areas

  • Economics and Econometrics

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