Convenience Sampling
Non-probability samples, which are unrestricted, are known as convenience samples. Researcher or field workers have the freedom to choose whomever they find; thus the name convenience. The convenience sample may consist of respondents living in an easily accessible locality. Undoubtedly, it is the simplest and least reliable form of non-probability sampling. The primary virtue is its low cost.
While a convenience sample has no control to ensure precision, this method is quite frequently used, especially in market research and public opinion surveys. They are used because probability sampling is often a time-consuming and expensive procedure and in fact, may not be feasible in many situations. In the early stages of exploratory research, when one is seeking guidance, this approach is recommended.
Accidental Sampling
An accidental type sampling is one in which the selection of the cases is made whatever happens to be available instantly.
In such sampling, individuals are selected as they appear in a process. If it is decided that only diabetic patients will be chosen from a queue in front of a hospital counter, the resulting sample will lead to an accidental sampling procedure.
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