Cluster Sample Size Calculator: Intraclass Correlation

How many clusters to sample when respondents come in groups, using the intraclass correlation.

Population size

Number of clusters available

Intraclass correlation (ICC)

Target margin of error

Confidence level

Expected response rate

Calculating…

Design effect vs. intraclass correlation at your average cluster size. Small ICC moves explode the required sample; the marker shows your ICC.

Assumption check

For cluster designs (schools, clinics, neighborhoods). The intraclass correlation drives the design effect, and the design effect drives everything.

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