Definition: Random sampling

OECD - Business tendency surveys

Any method of selecting a sample based on the theory of probability. At any stage of the process of selection the probability of any set of units being selected must be known. It is the only general method known which can provide a measure of precision of the estimate. Sometimes the term random sampling is used in the sense of probability sampling.
Organization for Economic Cooperation and Development (OECD), "Business Tendency Surveys - A Handbook", OECD, Paris, 2003

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