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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 about whom information is needed; also called universe or population of interest. |
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Definition
| Collection of data obtained from or about every member of the population of interest. |
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Definition
| Subset of all the members of a population of interest. |
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Definition
| list of population elements from which units to be sampled can be selected or a specified procedure for generating such a list. |
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Definition
| Method of generating lists of phone numbers at random. |
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Definition
| Samples in which every element of the population has a known, non-zero likelihood of selection. |
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Definition
| Samples in which specific elements from the population have been selected in a nonrandom manner. |
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Definition
| The identified and selected population subset for the survey, chosen because it represents the entire group. |
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Definition
| A value that accurately portrays or typifies a factor of a complete population, such as average age or income. |
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| Error that occurs because the sample selected is not perfectly representative of the population. |
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Definition
| All error other than sampling error; also called measurement error. |
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Definition
| Probability sample selected by assigning a number to every element of the population and then using a table of random numbers to select specific elements for inclusion in the sample. |
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Definition
| Probability sampling in which the entire population is numbered and elements are selected using a skip interval. |
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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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Term
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Definition
| Sampling in which the number of elements selected from a stratum is directly proportional to the size of the stratum relative to the size of the population. |
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Term
| disproportional, or optimal, allocation |
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Definition
| Sampling in which the number of elements taken from a given stratum is proportional to the relative size of the stratum and the standard deviation of the characteristic under consideration. |
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Term
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Definition
| Probability sample in which the sampling units are selected from a number of small geographic areas to reduce data-collection costs. |
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Definition
| Geographic areas selected for national or regional surveys in progressively smaller population units, such as countries, then residential blocks, then homes. |
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Definition
| Nonprobability samples based on using people who are easily accessible. |
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Definition
| Nonprobability samples in which the selection criteria are based on the researcher's personal judgement about representatives of the population under study. |
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Definition
| Nonprobability samples in which quotas, based on demographic or classification factors selected by the researchers, are established for population subgroups. |
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Term
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Definition
| Nonprobability samples in which additional respondents are selected based on referrals from initial respondents. |
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