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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.
Snowball Samples: Often used when a target population is rare. Members of the target population recruit other members of the population for the survey. Quota Samples: The sample is designed to include a designated number of people with certain specified characteristics. For example, 100 coffee drinkers.
IOIO (pronounced yo-yo) is a series of open source PIC microcontroller-based boards that allow Android mobile applications to interact with external electronics. [ 2 ] [ 3 ] [ 4 ] The device was invented by Ytai Ben-Tsvi in 2011, and was first manufactured by SparkFun Electronics .
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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.
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.
Snowball Earth—a nickname that refers to the way our planet must have looked from space at the time—was the reality of our planet during two major ancient freezes. And now, researchers may ...