NON-PROBABILITY SAMPLING METHODS

• Convenience Sampling


  Involves choosing respondents at the convenience of the researcher. It is also called accidental or incidental sampling.
• Convenience Sampling


  • A researcher intends to study the elementary students of a particular school and has determined the desired sample size. Due to the study's constraints, the elementary pupils who are present at the time of the researcher's visit to the school will be chosen as respondents.
• Purposive Sampling


  Involves handpicking subjects, usually to suit very specific intentions. This is also called judgmental sampling.
• Purposive Sampling


  • In a study about honor students, the researcher uses a list of honor students and chooses the necessary number of respondents, to the exclusion of all other students.
• Quota Sampling


  Is somewhat similar to stratified sampling, in that the population is divided into strata, and the researcher deliberately sets specific proportions in the sample, whether or not the resulting proportion is reflective of the total population. This is commonly done to ensure the inclusion of a particular segment of the population.
• Quota Sampling


  • A researcher wants to survey the employees of a company regarding their thoughts on the company's new policies. The researcher intends to have representatives from all departments in his sample, but one department is so small that doing random sampling might result in that department not being represented. The researcher then sets a quota of respondents from that department to ensure their inclusion in the sample.
• Volunteer Sampling


  Involves people who self-select into the survey. Often, these folks have a strong interest in the main topic of the survey.
• Volunteer Sampling


  • A noontime show like 'It's Showtime asks viewers to participate in an online poll, or to vote for the winner in "Tawag ng Tanghalan." This would be a volunteer sample since the sample is chosen by the viewers, not by the survey administrator.
• Snowball Sampling


  Does not give a specific set of samples, similar to snow expanding widely or rolling rapidly. This is true for a study involving unspecified group of people. Dealing with varied groups of people such as street children, drug dependents, gang members, informal settlers, street vendors, and the like is possible in this kind of non-probability sampling.
• Snowball Sampling


  achieved by asking a participant to suggest someone else who might be willing or appropriate for the study.