Sociology 2206A/B Chapter Notes - Chapter 7: Simple Random Sample, Statistical Inference, Sampling Error
14 Feb 2017
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They use nonprobability/non-random samples in their studies. Get any cases in any manner that is convenient. Get a pre-set number of cases in each of several predetermined categories (ie 50 women and 50 men) that will reflect the diversity of the population, using haphazard methods. Get all possible cases that fit particular criteria, using various methods. Appropriate in three situations: selecting unique cases that are especially informative, selects members of a difficult to reach, specialized population, used when a researcher wants to identify particular types of cases for in-depth investigation. Get cases using referral from one or a few cases, then referrals from those cases, and so on (often used when investigating illegal activity) Get cases until there is no additional information or new characteristics. Special case of purposive sampling: deviant case sampling. Researcher seeks cases that differ from the dominant pattern. The goal is to locate a collection of unusual cases that are not representative of the whole.
