04 Snowball sampling Snowball Sampling Snowball sampling is

04 Snowball sampling

Snowball Sampling Snowball sampling is a sampling method that expands gradually from less to more by means of the naturally formed interpersonal network like snowball rolling. Snowball sampling is often used to investigate the phenomenon of public opinion in a special group of people. Snowball sampling is a sampling method between random sampling and non-random sampling. Its normal state is non-random. If snowball sampling is to become random sampling, it must be randomly selected from all sampling units in each stage. Snowball sampling was carried out in stages. The first step is to interview several people with the characteristics of the subject from people known to the researcher, and use these people as contributors, relying on them to identify other qualified people. The second step is to interview these people and have them lead you to the more people you want to interview in the third step. And so on, gradually expanding the number of visitors until the required sample size is reached. Snowball sampling is used especially for observational studies and is particularly suitable for community studies. It is also suitable for the study of special types of people (such as disabled people, drug addicts and bridge enthusiasts). However, the sample representativeness of snowball sampling method is relatively low. Smart Gao 高浩然 164 S 17114