Data Collectionhard
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A health survey uses residential telephone numbers to estimate disease prevalence. The sampling frame covers ~90% of the population. Analysis of undercoverage reveals:
- Recent migrants: 5% of population, 40% undercovered, disease prevalence = 18%
- Elderly rural residents: 3% of population, 60% undercovered, disease prevalence = 14%
- Homeless individuals: 1% of population, 100% undercovered, disease prevalence = 35%
(Overall population prevalence ≈ 12%)
Which undercovered group introduces the largest bias in the prevalence estimate?
A health survey uses residential telephone numbers to estimate disease prevalence. The sampling frame covers ~90% of the population. Analysis of undercoverage reveals:
- Recent migrants: 5% of population, 40% undercovered, disease prevalence = 18%
- Elderly rural residents: 3% of population, 60% undercovered, disease prevalence = 14%
- Homeless individuals: 1% of population, 100% undercovered, disease prevalence = 35%
(Overall population prevalence ≈ 12%)
Which undercovered group introduces the largest bias in the prevalence estimate?