Snowball sampling is a special nonprobability method used when. Snowball sampling also known as chainreferral sampling is a nonprobability non random sampling method used when characteristics to be possessed by samples are rare and difficult to find. Scribd is the worlds largest social reading and publishing site. Snowball sampling is defined as a nonprobability sampling technique in which the samples have traits that are rare to find. Snowball sampling is a nonprobability sampling method. Snowball sampling is a wellknown, nonprobability method of survey sample selection that is commonly used to locate hidden populations. Snowball sampling, in general application, is a type of convenience sample. In this blog you will read about the types and method of snowball sampling along with its advantages and disadvantages. Both of these works are typical in that they contain only sparse accounts of the sampling method. Using social media and targeted snowball sampling to.
In sociology, snowball sampling refers to a nonprobability sampling technique which includes purposive sampling in which a researcher begins with a small population of known individuals and expands the sample by asking those initial participants to identify others that should participate in the study. Non probability sampling free download as powerpoint presentation. Nonprobability sampling research methods knowledge base. Snowball sampling is a commonly employed sampling method in. Researchers use this sampling method if the sample for the study is very rare or is limited to a very small subgroup of the population. In many of these later applications, the snowball sample started with a sample of convenience the seeds from the population of interest, not with a random. Comparision of snowball sampling and sequential sampling. If you are trying to recruit people who are difficult to identify or have to meet certain criteria to participate, then. For example, if you are studying the level of customer satisfaction among elite nirvana bali golf club in. This is a technique to get in contact with people from an evasive population, for example a population of homeless persons or of drug addicts. At least with a probabilistic sample, we know the odds or probability that we have.
Sociology at surrey university of surrey research socialupdate. Snowball sampling is a nonprobability sampling technique that is used by researchers to identify potential subjects in studies where subjects are hard to locate. One of the most wellknown forms of nonprobability sampling is the snowball sampling method, which is particularly. It doesnt have the probability involved, with say, simple random sampling where the. While these projects define themselves as global surveys, the methodology they use, and particularly the sampling methods they apply, cast doubt on the. It was used in lindesmiths original study of opiate addiction 1968 as well as in beckers work on marijuana smokers 1966. Random sampling methods involve some form of random. One subject gives the researcher the name of another subject, who in turn provides the name of a third, and so on vogt, 1999. In other words, the sample starts small but snowballs into a larger sample through the. Enhancing the sample diversity of snowball samples plos. Snowball sampling or chainreferral sampling is defined as a nonprobability sampling technique in which the samples have traits that are rare to find. Snowball sampling snowball sampling may simply be defined as. Even these researchers may nevertheless consider nonprobability. Several years after colemans and goodmans development of snowball sampling, what was also termed snowball sampling emerged as a nonprobability approach to sampling design and inference.
This method relies on referrals from initially sampled. In effect, what we would like to be sampling is not people, but ideas. Media and targeted snowball sampling 282 ples and the asystematic recruitment of research subjects in convenience samples on the one hand and the more rigid cluster and stratified samples on the other. Thus the sample group is said to grow like a rolling snowball. As described in leo goodmans 2011 comment, snowball sampling was developed by coleman 19581959 and goodman 1961 as a means for studying the structure of social networks. In sociology and statistics research, snowball sampling is a nonprobability sampling technique where existing study subjects recruit future subjects from among their acquaintances. Nonprobability sampling is used in social research when random sampling is not feasible. Unlike convenience samples, research subjects are selected for specific attributes that preliminary research has defined as targets. Snowball sampling method does not require complex planning and the staffing.
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