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In sociology and statistics research, snowball sampling [1] (or chain sampling, chain-referral sampling, referral sampling [2] [3]) is a nonprobability sampling technique where existing study subjects recruit future subjects from among their acquaintances. Thus the sample group is said to grow like a rolling snowball.
In social science research, snowball sampling is a similar technique, where existing study subjects are used to recruit more subjects into the sample. Some variants of snowball sampling, such as respondent driven sampling, allow calculation of selection probabilities and are probability sampling methods under certain conditions.
Longitudinal study; Longstaff–Schwartz model; Lorenz curve; Loss function; Lot quality assurance sampling; Lotka's law; Low birth weight paradox; Lucia de Berk – prob/stats related court case; Lukacs's proportion-sum independence theorem; Lumpability; Lusser's law; Lyapunov's central limit theorem
Judgment sampling or purposive sampling, where the researcher chooses the sample based on who they think would be appropriate for the study. This is used primarily when there is a limited number of people that have expertise in the area being researched, or when the interest of the research is on a specific field or a small group.
1. The main definition can include some more details like. For eg: under Nonprobability sampling, "Snowball sampling" can be best example of Purposive Sampling or Judgmental sampling. The definition can be improved with respect to some other aspects. 2.
The process of collecting information from a sample is referred to as sampling. Sampling methods may be either random (random sampling, systematic sampling, stratified sampling, cluster sampling) or non-random/nonprobability (convenience sampling, purposive sampling, snowball sampling). [3]
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In social science research, snowball sampling, or "snowballing": a technique for developing a research sample; In researching a field, snowballing is another name for Pearl growing; In chemical and industrial engineering, snowballing is the second and last phase, after aggregation, of the pelletization process.