non probability sampling definition types advantages and disadvantages pdf

Non Probability Sampling Definition Types Advantages And Disadvantages Pdf

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Nonprobability sampling

Knowing some basic information about survey sampling designs and how they differ can help you understand the advantages and disadvantages of various approaches. Probability gives all people a chance of being selected and makes results more likely to accurately reflect the entire population. That is not the case for non-probability. In a perfect world you could always use a probability-based sample, but in reality, you have to consider the other factors affecting your results availability, cost, time, what you want to say about results. It is also possible to use both different types for the same project.

Non-Probability Sampling: Definition, types, Examples, and advantages

Sampling is the use of a subset of the population to represent the whole population or to inform about social processes that are meaningful beyond the particular cases, individuals or sites studied. Probability sampling, or random sampling , is a sampling technique in which the probability of getting any particular sample may be calculated. Nonprobability sampling does not meet this criterion. Nonprobability sampling techniques are not intended to be used to infer from the sample to the general population in statistical terms. Instead, for example, grounded theory can be produced through iterative nonprobability sampling until theoretical saturation is reached Strauss and Corbin, Thus, one cannot say the same on the basis of a nonprobability sample than on the basis of a probability sample.

In non-probability sampling also known as non-random sampling not all members of the population has a chance of participating in the study. This is contrary to probability sampling , where each member of the population has a known, non-zero chance of being selected to participate in the study. In these cases, sample group members have to be selected on the basis of accessibility or personal judgment of the researcher. Therefore, the majority of non-probability sampling techniques include an element of subjective judgement. Non-probability sampling is the most helpful for exploratory stages of studies such as a pilot survey. The issue of sample size in non-probability sampling is rather ambiguous and needs to reflect a wide range of research-specific factors in each case.

Advantages and disadvantages. A major advantage with non-probability sampling is that—compared to probability sampling—it's very cost- and time-​effective. It's.

More than Just Convenient: The Scientific Merits of Homogeneous Convenience Samples

When to use it. Ensures a high degree of representativeness, and no need to use a table of random numbers. When the population is heterogeneous and contains several different groups, some of which are related to the topic of the study.

Pros and Cons of Different Sampling Methods

Non-probability sampling derives its control from the judgement of the investigator. In non-probability sampling, the cases are selected on bases of availability and interviewer judgement. Non-probability sampling has its strength in the area of convenience.

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