Purposive sampling, also known as judgmental , selective or subjective sampling, is a type of non-probability sampling technique. Non-probability sampling focuses on sampling techniques where the units that are investigated are based on the judgement of the researcher [see our articles: Non-probability sampling to learn more about non-probability sampling, and Sampling: The basics , for an introduction to terms such as units , cases and sampling ]. There are a number of different types of purposive sampling, each with different goals. This article explains a what purposive sampling is, b the eight of the different types of purposive sampling, c how to create a purposive sample, and d the broad advantages and disadvantages of purposive sampling.

## Laerd Dissertation Purposive Sampling Advantages

## Sampling Strategy: A dissertation guide | Lærd Dissertation

Non-probability sampling represents a group of sampling techniques that help researchers to select units from a population that they are interested in studying. Collectively, these units form the sample that the researcher studies [see our article, Sampling: The basics , to learn more about terms such as unit , sample and population ]. A core characteristic of non-probability sampling techniques is that samples are selected based on the subjective judgement of the researcher, rather than random selection i. Whilst some researchers may view non-probabilit y sampling techniques as inferior to probability sampling techniques, there are strong theoretical and practical reasons for their use. This article discusses the principles of non-probability sampling and briefly sets out the types of non-probability sampling technique discussed in detail in other articles within this site. The article is divided into two sections: principles of non-probability sampling and types of non-probability sampling :.

### Snowball sampling

Probability sampling represents a group of sampling techniques that help researchers to select units from a population that they are interested in studying. Collectively, these units form the sample that the researcher studies [see our article, Sampling: The basics , to learn more about terms such as unit , sample and population ]. A core characteristic of probability sampling techniques is that units are selected from the population at random using probabilistic methods. This enables researchers to make statistical inferences i. This article discusses the principles of probability sampling and briefly sets out the types of probability sampling technique discussed in detail in others articles within this site.

Total population sampling is a type of purposive sampling technique that involves examining the entire population i. Whilst total population sampling is infrequently used, there are specific types of research where total population sampling can be very useful. This article a explains what total population sampling is and when it may be appropriate to use it, b sets out some examples of total population sampling, c shows how to create a total population sample, and d discusses the advantages and disadvantages of total population sampling. Total population sampling is a type of purposive sampling technique where you choose to examine the entire population i. In sampling, units are the things that make up the population.

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