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18 Cards in this Set
- Front
- Back
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Any technique in which samples are selected in some way not suggested by probability theory?
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nonprobability sampling
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4 types of nonprobability sampling?
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Reliance on Available Subjects
Purposive or judgmental sampling snowball sampling quota sampling |
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Sampling in which the units to be observed are selected on the basis of the researcher's judgment about which ones will be the most useful or representative.
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Purposive of Judgmental Sampling
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Sampling method often employed in field research, whereby each person interviewed may be asked to suggest additional people for interviewing
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Snowball sampling (nonprobability)
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Sampling method in which units are selected into a sample basis of prespecified characteristics, so that total sample will have the same distribution of characteristics assumed to exist in the population being studied.
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Quota sampling (nonprobability)
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Someone well versed in the social phenomenon that you wish to study and who is willing to tell you what he or she knows about it //A member of the group who can talk directly about the group per se
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informant (NOT THE RESPONDENT!)
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The general term for samples selected in accord with probability theory, typically involving some random-selection mechanism.
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Probability sampling
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Examples of probability sampling
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EPSEM, PPS, SImple random sampling and systematic sampling
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The quality of a sample of having the same distribution of characteristics as the population from which it was selected//thus descriptions and explanations derived from an analysis of the sample may be assumed to represent similiar ones in the population
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Representativeness
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What is enhanced by probability sampling?
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representativeness-
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A sample design in which each member of a population has the same chance of being selected into the sample
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Equal Probability of Selection Method (EPSEM)
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The unit of which a population is composed and which is selected in a sample
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ELEMENT- (units of analysis are used in data anylwysis while elements are for sampling)
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The theoretically specified aggregation of the elements in a study
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POPULATION-
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the aggregation of elements from which a sample is actually selected
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Study population
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A sampling method in which each element has an equal chance of selection independent of any other event in the selection process
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Random sampling
Example: flipping a coin |
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That element or set of elements considered for selection in some stage of sampling
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Sampling Unit
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The summary description of a given variable in a population
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Parameter
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When researchers gneralize from a sample, they're using sample observations to estimate population ________
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Parameters
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