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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.
Nonprobability sampling is a form of sampling that does not utilise random sampling techniques where the probability of getting any particular sample may be calculated. Nonprobability samples are not intended to be used to infer from the sample to the general population in statistical terms.
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Moments, method of – see method of moments ... Quantitative research; ... Snowball sampling; Systematic sampling;
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]
As long ago as 1990 Van Meter summarised research that showed snowball sampling can be representative if selection for the sample is treated as a stochastic process and the probability of selection for the sample is calculated. On the other hand, Guttman showed that random samples with low response rates can be extremely unrepresentative.
In fact, past research has found that nasal discharge turns different colors due to the presence of white blood cells, which battle the infection. However, ...