of a new subject is guided by the aim and objectives of the study. Ask new cases to identify further cases (and so on). This pattern is continued until the sample group is fully formed. Male or female types of drug user (e.g. In the case of drug users, it may be obvious to identify strata such as gender (i.e. Formation of a sample group starts with only one subject and the subject provides only one referral. Creating a snowball sample, to create a snowball sample, there are two steps : (a) trying to identify one or more units in the desired population; and (b) using these units to find further units and so on until the sample size is met. Non-probability sampling to learn more about non-probability sampling. The first subject recruited to the sample group provides multiple referrals.
Disadvantages of Snowball Sampling, oversampling a particular network of peers can lead to bias. Studies with snowball sampling can be completed in a short duration of time. It is not possible to determine the actual pattern of distribution of population. In other words, snowball sampling method is based on referrals from initial subjects to generate additional subjects. Each new referral is explored until primary data from sufficient amount of samples are collected.
Snowball sampling is a type of non-probability sampling technique.
Non- probabilit y sampling focuses on sampling techniques that are based on the judgement.
It can be impossible to identify any sampling error and create statistical inferen ces from the sample to the population.
Namely, the snowball sampling technique is detailed in page 184.
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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.e., one or two units). The unknown and/or secretive nature of some social groups may also make it difficult to identify strata that warrant investigation. Stop when: a) Your pre-specified sample size has been completed; b) There are no further cases left; c) Pursuing further cases will make the project unmanageable due to the large size. Step TWO, use these units to find further units and so on until the sample size is met. Request the initial cases to identify more cases. There may be no other way of accessing your sample, making snowball sampling the only viable choice of sampling strategy. Snowball sampling: Problems and techniques of chain referral sampling. Exponential discriminative snowball sampling. This stage is usually the most difficult one. Further reading Biernacki,., Waldorf,. Snowball sampling is a non-probability based sampling technique that can be used to gain access to such populations. 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.