Simple random sample
In statistics, a simple random sample is a subset of individuals (a sample) chosen from a larger set (a population). Each individual is chosen randomly and entirely by chance, such that each individual has the same probability of being chosen at any stage during the sampling process, and each subset of k individuals has the same probability of being chosen for the sample as any other subset of k individuals.
A simple random sample (or single stage random) is an example of a probability sample. It is the ideal sampling frame for a survey because each eligible individual in the population has a known and non-zero chance of being included in the sample. However, this sampling frame is very expensive and often not logistically feasible. As a result, most surveys employ some form of cluster sampling.
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