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Determinants of Sample Size (Factors and Constraints)

Sample size (households) depends on many factors:

Expected size estimate of indicators

Expected size estimate of target population(s)

Average household size

Margin of error wanted

Level of confidence wanted

“Design effect” (increase in sample error due to use of cluster survey instead of simple random sample)

Expected non-response rate

Number of clusters or PSUs

Cluster size (number of households per sample cluster)

Number of sub-national areas for separate estimates (domains)

Survey budget and implementing capability

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