Glossary

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S

sample

Single units from a category (e.g. human, animal, farm) selected to be representative of the category as a whole.

sampling frame

A list of all sampling units in the source population.

sampling unit

The basic element(s) of the population we are sampling. This is often the case when sampling is conducted in multiple steps, or stages. For example, we may have: 

  • farms (primary sampling unit) 
  • pens or sheds (secondary sampling unit) 
  • individual animals (tertiary sampling unit).

source (study) population

The actual population from which eligible study subjects are drawn, such as commercial broiler farms in selected provinces. Ideally, the source population should be the same as the target (reference) population, but this is often not practical.

study sample

The units selected from the source population; for example, 200 birds from five flocks on ten farms.

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