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Definition
| process of obtaining information from a subset of a larger group |
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Definition
| entire group of people from which information is needed |
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Definition
| population elements from which units to be sampled can be selected |
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Definition
| method of generating lists of telephone numbers at random |
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Definition
every element of the population has a known, non-zero likelyhood of seletion
drawn using a skip interval |
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Definition
specific elements from the population have been selected at random
less expensive, most convienient, least time consuming |
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Definition
the identified and selected population subset for the survey
represents entire group |
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Definition
a value that accurately portrays or typifies a factor of a complete population.
"average age or income" |
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Definition
| error that occurs because the sample selected does is not perfectly representative of the population |
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| all other errors; aka measurement errors |
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Definition
everyone gets a number, random number generator selects elements included
probability |
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Definition
entire population is numbered, elements selected by skip interval
probability |
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Definition
| probability sample that is forced to be more representative through simple random sampling of mutually exclusive and exhaustive subsets |
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Definition
| number of elements selected from a stratum proportional to size of stratum, relative to size of the population |
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Definition
| probability sample, units selected from a number of small geographic areas to reduce data collection costs |
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Definition
| geographic areas selected from smaller populations. starts from county, narrows down to neighborhood, then select homes |
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Definition
| non-probability sampling, based on using people who are easily accessible |
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Definition
| nonprobability samples, selection criterion based on the researchers professional judgement about representativeness of population |
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Definition
| non probability samples, based on demographic or classification factors selected by researcher |
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Term
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Definition
Non-probability samples in which selection of additional respondents is based on referrals from the initial respondents.
appropriate for rare population (rocket scientists) |
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