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In quota sampling the selection of the sample is non-random. For example interviewers might be tempted to interview those who look most helpful. - read more

Probability sampling, or random ... the effect of education on earnings is to use a non-probability sample of persons who could ... (statistics) Cluster sampling; - read more

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**General:**Measurement, Sampling, Statistics, Error, Survey methodology, Sample, Cluster sampling, Errors and residuals in statistics, Random sample, Non-sampling error

**Organization:**International Statistical Institute

**Facility:**International Statistical Institute