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Is volunteer sampling non-probability sampling?

Questionnaire sampling methods include probability sampling and non-probability sampling.

Probability sampling includes: random sampling (lottery method, random number method, sampling with replacement, sampling without replacement), stratified sampling (dividing the overall unit into different groups according to certain characteristics or rules) strata, and then randomly select a certain number of sampling units from each stratum to form a sample), cluster sampling, and systematic sampling.

Non-probability sampling: convenience sampling, judgment sampling.