Araçlar / Study Planning

Prevalence Sample Size Calculator

Estimate sample size for a prevalence study with optional finite population, design effect, and non-response adjustment.

Help notes

Use proportions, not percentages. For example, enter 0.2 for 20% expected prevalence and 0.05 for a 5 percentage-point margin of error.

Girdi

Değerleri girin ve hesaplanan çıktıları inceleyin.

Expected prevalence Use a proportion, e.g. 0.2 for 20%. Margin of error Use a proportion, e.g. 0.05 for +/- 5 percentage points. Confidence level Custom z value Leave as 0 to use the selected confidence level. Population size Leave as 0 if finite population correction is not needed. Design effect Non-response rate Use a proportion, e.g. 0.1 for 10%.

Sonuçlar

Base sample size

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Finite-population corrected sample size

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Design-adjusted sample size

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Final sample size after non-response adjustment

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Interpretation

This calculator uses the standard single-proportion sample size formula. Treat the result as a planning estimate and document the assumptions used.