Judgment sample

Judgment sample, or Expert sample, is a type of nonrandom sample that is selected based on the opinion of an expert. Results obtained from a judgment sample are subject to some degree of bias, due to the frame and population not being identical. The frame is a list of all the units, items, people, etc., that define the population to be studied. Judgement sampling is not often recommended, as it limits the types of statistical analyzes you may reasonably perform. This is because Judgement Samples are not a form of random selection and have inherit bias. Judgement Sampling is use it narrow circumstances, usually when the population of interest is very small or specific. An example could be summa cum laude graduates from a college. The researcher could select individuals who meet the qualifications and would be more willing or able to provide detailed information about the difficulties in obtaining the distinction. A random sample would provide less bias, but potentially less raw information. The downfalls of this system are significant as any non-random sample brings bias into question, which limits the types of statistical analyzes you may reasonably perform, and there are considerable limits to an experts ability to choose a good sample.

References

• Deming, W. Edwards (1990). Sample Design in business research. John Wiley and Sons. p. 31. ISBN 0-471-52370-4.

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