Types of Non-Probability Sampling
Convenience Sampling
Convenience sampling is probably the most common of all sampling techniques. With convenience sampling, the samples are selected because they are accessible to the researcher. Subjects are chosen simply because they are easy to recruit. This technique is considered easiest, cheapest and least time consuming.
Consecutive Sampling
Consecutive sampling is very similar to convenience sampling except that it seeks to include ALL accessible subjects as part of the sample. This non-probability sampling technique can be considered as the best of all non-probability samples because it includes all subjects that are available that makes the sample a better representation of the entire population.
Quota Sampling
Quota sampling is a non-probability sampling technique wherein the researcher ensures equal or proportionate representation of subjects depending on which trait is considered as basis of the quota.
For example, if basis of the quota is college year level and the researcher needs equal representation, with a sample size of 100, he must select 25 1st year students, another 25 2nd year students, 25 3rd year and 25 4th year students. The bases of the quota are usually age, gender, education, race, religion and socioeconomic status.
Judgmental Sampling
Judgmental sampling is more commonly known as purposive sampling. In this type of sampling, subjects are chosen to be part of the sample with a specific purpose in mind. With judgmental sampling, the researcher believes that some subjects are more fit for the research compared to other individuals. This is the reason why they are purposively chosen as subjects.
Snowball Sampling
Snowball sampling is usually done when there is a very small population size. In this type of sampling, the researcher asks the initial subject to identify another potential subject who also meets the criteria of the research. The downside of using a snowball sample is that it is hardly representative of the population.
When to Use Non-Probability Sampling
• This type of sampling can be used when demonstrating that a particular trait exists in the population.
• It can also be used when the researcher aims to do aqualitative, pilot or exploratory study.
• It can be used when randomization is impossible like when the population is almost limitless.
• It can be used when the research does not aim to generate results that will be used to create generalizationspertaining to the entire population.
• It is also useful when the researcher has limited budget, time and workforce.
• This technique can also be used in an initial study which will be carried out again using a randomized, probability sampling.
Types of Non-Probability Sampling
Convenience Sampling
Convenience sampling is probably the most common of all sampling techniques. With convenience sampling, the samples are selected because they are accessible to the researcher. Subjects are chosen simply because they are easy to recruit. This technique is considered easiest, cheapest and least time consuming.
Consecutive Sampling
Consecutive sampling is very similar to convenience sampling except that it seeks to include ALL accessible subjects as part of the sample. This non-probability sampling technique can be considered as the best of all non-probability samples because it includes all subjects that are available that makes the sample a better representation of the entire population.
Quota Sampling
Quota sampling is a non-probability sampling technique wherein the researcher ensures equal or proportionate representation of subjects depending on which trait is considered as basis of the quota.
For example, if basis of the quota is college year level and the researcher needs equal representation, with a sample size of 100, he must select 25 1st year students, another 25 2nd year students, 25 3rd year and 25 4th year students. The bases of the quota are usually age, gender, education, race, religion and socioeconomic status.
Judgmental Sampling
Judgmental sampling is more commonly known as purposive sampling. In this type of sampling, subjects are chosen to be part of the sample with a specific purpose in mind. With judgmental sampling, the researcher believes that some subjects are more fit for the research compared to other individuals. This is the reason why they are purposively chosen as subjects.
Snowball Sampling
Snowball sampling is usually done when there is a very small population size. In this type of sampling, the researcher asks the initial subject to identify another potential subject who also meets the criteria of the research. The downside of using a snowball sample is that it is hardly representative of the population.
When to Use Non-Probability Sampling
• This type of sampling can be used when demonstrating that a particular trait exists in the population.
• It can also be used when the researcher aims to do aqualitative, pilot or exploratory study.
• It can be used when randomization is impossible like when the population is almost limitless.
• It can be used when the research does not aim to generate results that will be used to create generalizationspertaining to the entire population.
• It is also useful when the researcher has limited budget, time and workforce.
• This technique can also be used in an initial study which will be carried out again using a randomized, probability sampling.
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