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Table 1 Definitions of population groups

From: Sampling method for surveying complex and multi-institutional partnerships: lessons from the Global Polio Eradication Initiative

The definition of target, source, and study populations are interrelated and are a starting point for the methods described in this paper. These concepts are defined as follows [4];
• Target Population: The collection of individuals, items, measurements, etc., about which inferences are desired. The term is sometimes used to indicate the population or group from which a sample or study population is drawn and sometimes to denote a reference population about which inferences are desired
• Source Population: The group from which a study group is selected
• Study Population: The group selected for investigation.