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Snowball Sampling Chain Referral Sampling. Share this page on your website: Chain Referral Sampling Snowball sampling is a non-probability sampling technique that is used by researchers to identify potential subjects in studies where subjects are hard to locate.
This article is a part of the guide: Select from one of the other courses available: Don't miss these related articles:. Check out our quiz-page with tests about: Back to Overview "Sampling". Search over articles on psychology, science, and experiments. Snowball sampling is a non-probability based sampling technique that can be used to gain access to such populations. To create a snowball sample, there are two steps: Imagine that the population we are interested in are students that download pirate music over the Internet or that take drugs.
Let's go with the latter: Each student is referred to as a unit [see our article, Sampling: The basics , if you are unsure about the terms unit , case , object , sample and population ]. Collectively, all student drug users make up our population. However, we are only interested in examining a sample of these student drug users.
First, we need to try and find one or more units from the population we are studying i. Finding just a small number of individuals willing to identify themselves and take part in the research may be quite difficult, so the aim is to start with just one or two students i. Due to the sensitivity of the study, the researcher should ask the initial students who agreed to take part in the research to help identify other students that may be willing to take part. For ethical reasons, these new research participants should come forward themselves rather than being identified by the initial students.
In this respect, the initial students help to identify additional units that will make up our sample. The process continues until sufficient units have been identified to meet the desired sample size. Snowball sampling is a useful choice of sampling strategy when the population you are interested in studying is hidden or hard-to-reach. Snowball sampling is useful in such scenarios because:.
It can be difficult to identifying units to include in your sample, perhaps because there is no obvious list of the population you are interested in.
For example, there are no lists of drug users or prostitutes that a researcher could get access to, especially lists that could be considered representative of the population of drug users or prostitutes. The sensitivity of coming forward to take part in research is more acute in such research contexts.
Individuals that are drug users or prostitutes, for example, are likely to be less willing to identify themselves and take part in a piece of research than many other social groups. However, since snowball sampling involves individuals recruiting other individuals to take part in a piece of research, there may be common characteristics, traits and other social factors between those individuals that help to break down some of the natural barriers that prevent such individuals from taking part.
Strata are simply sub-groups within a population. In the case of drug users, it may be obvious to identify strata such as gender i. Whilst is it typical to define the characteristics of the sample you want to examine at the start of the research process, the snowball sample may also be helpful in exploring potentially unknown characteristics that are of interest before settling on your sampling criteria.
There may be no other way of accessing your sample, making snowball sampling the only viable choice of sampling strategy.
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.
Snowball sampling involves primary data sources nominating another potential primary data sources to be used in the research.
Snowball sampling is a non-probability sampling technique that is used by researchers to identify potential subjects in studies where subjects are hard to locate. Jul 05, · ACCESS DENIED. For access to the following page, please contact [email protected] Someone from our team will be in touch with you shortly.
Many activist investors pour in tons of research and express their opinions about the valuation of a company in their filing. Typically, this information is not available in public domain. We have a dedicated page which tracks and monitors such information. However, since snowball sampling involves individuals recruiting other individuals to take part in a piece of research, there may be common characteristics, traits and other social factors between those individuals that help to break down some of the natural barriers .