Stratum Allocation and Oversample Calculator

Allocate completes across strata with priority weights, then convert the plan to draws with a response-rate adjustment for each stratum.

Target margin of error per stratum

Design effect

Confidence level

Total completes target

Stratum 1 population

Stratum 1 response rate

Stratum 1 priority weight

Stratum 2 population

Stratum 2 response rate

Stratum 2 priority weight

Stratum 3 population

Stratum 3 response rate

Stratum 3 priority weight

Calculating…

Oversample draws per stratum. Priority weights tilt completes toward the groups weighted highest.

Assumption check

For stratified designs that oversample small or priority groups. Three strata; weights express priority, not precision.

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