User:Tanmiao52/sandbox

"Usage Assumption" The participants are likely to know others who share the characteristics that make them eligible for inclusion in the study.

"'Advantages"' 1. This method is particularly useful for locating hidden populations. It is possible for the surveyors to include people in the survey that they would not have known. no lists or other obvious sources for locating members of the population of specific interest It is also very good for locating people of a specific population if they are difficult to locate.

"'Disadvantages"' The first participants will have strong impact on the sample   Snowball sampling is inevitable in social systems Snowball sampling contradicts many of the assumptions supporting conventional notions of random selection and representativeness There is no way to know the total size of the overall population.