Nonprobability sampling

purposive samplingnon-probability samplingjudgmental samplingnonprobabilitynonprobability samplepurposive sample
Sampling is the use of a subset of the population to represent the whole population or to inform about (social) processes that are meaningful beyond the particular cases, individuals or sites studied.wikipedia
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Sampling (statistics)

samplingrandom samplesample
Sampling is the use of a subset of the population to represent the whole population or to inform about (social) processes that are meaningful beyond the particular cases, individuals or sites studied.
Nonprobability sampling methods include convenience sampling, quota sampling and purposive sampling.

Convenience sampling

convenience sampleAccidental samplingConvenience Samples
Convenience sampling (also known as grab sampling, accidental sampling, or opportunity sampling) is a type of non-probability sampling that involves the sample being drawn from that part of the population that is close to hand.

Self-selection bias

self-selectionself-selectedself selection
This often introduces an important type of error, self-selection bias, in which a potential participant's willingness to volunteer for the sample may be determined by characteristics such as submissiveness or availability.
In statistics, self-selection bias arises in any situation in which individuals select themselves into a group, causing a biased sample with nonprobability sampling.

Snowball sampling

snowballingRespondent Driven Samplingrespondent-driven sampling
In sociology and statistics research, snowball sampling (or chain sampling, chain-referral sampling, referral sampling ) is a nonprobability sampling technique where existing study subjects recruit future subjects from among their acquaintances.

Consecutive sampling

Along with convenience sampling and snowball sampling, consecutive sampling is one of the most commonly used kinds of nonprobability sampling.

Simple random sample

random samplingsimple random samplingsampling without replacement
Probability sampling, or random sampling, is a sampling technique in which the probability of getting any particular sample may be calculated.

Statistical population

populationsubpopulationsubpopulations
Sampling is the use of a subset of the population to represent the whole population or to inform about (social) processes that are meaningful beyond the particular cases, individuals or sites studied.

Probability

probabilisticprobabilitieschance
Probability sampling, or random sampling, is a sampling technique in which the probability of getting any particular sample may be calculated.

Systematic sampling

systematic methodsystematic random samplingsystematic samples

Open-access poll

online pollonline web pollopen access poll
An open-access poll is a type of opinion poll in which a nonprobability sample of participants self-select into participation.

Randomization

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This would be contrasted with nonprobability sampling where arbitrary individuals are selected.

Social research and methods

social researchsociological researchsociological analysis
Sampling methods may be either random (random sampling, systematic sampling, stratified sampling, cluster sampling) or non-random/nonprobability (convenience sampling, purposive sampling, snowball sampling).

Outline of marketing

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LGBT Mormon suicides

A Nonprobability sampling technique observed Clinically significant symptoms of complex post-traumatic stress disorder related to religious beliefs and experiences at high rates among affiliated and disaffiliated LGBTQ Mormons in the study.

Social polling

Social polling is an example of nonprobability sampling that uses self-selection rather than a statistical sampling scheme.

Sociology

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Conversely, the impossibility of random sampling sometimes necessitates nonprobability sampling, such as convenience sampling or snowball sampling.

Sample (statistics)

samplesamplesstatistical sample
A sample that is not random is called a non-random sample or a non-probability sampling.