Sampling Methods

Sampling methods can be broadly classified into two types — probability and non-probability sampling.

Probability Sampling

In probability sampling the probability of an element being included in the sample is known, though the probability of inclusion may not be equal.

Probability sampling methods include simple random sampling, systematic sampling, stratified sampling and cluster sampling.

Non-Probability Sampling

Non-probability sampling involves subjective judgment in sample selection. Sampling errors cannot be computed because the probability of selection of any element in the population is unknown.

Examples of non-probability sampling include quota sampling, convenience sampling, purposive sampling and snowball sampling.

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