Proportional Allocation

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Calculate

Example: a survey of 200 students at a university with 5,000 humanities, 3,000 science and 2,000 life-science students. How many to interview in each field? Change the values to work out your own case.

Total sample n Size of each stratum N_h Separated by spaces or commas.

Step by step

What each term means

Stratum Sample (nₕ): How many units to draw within stratum h.
Total Sample (n): The survey's total, to be split among the strata.
Stratum Size (Nₕ): How many population units are in stratum h.
Population (N): The sum of all strata. Nₕ/N is the stratum's share of the population — and becomes its share of the sample.