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21 Cards in this Set
- Front
- Back
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The Sampling frame
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A list of elements from which a sample may be drawn; also called working population
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Sampling frame Error
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Occurs when certain sample elements are not listed or not accurately represented in a sampling frame
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Sampling Services (List Brokers)
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Provides lists or databases of the names, addresses, phone numbers, and email addresses of specific populations.
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Reverse Directory
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Provides the same information as a directory but in a diffirent format (by street name, etc)
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Online Panels
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Lists of respondents who have agreed to participate in marketing rsearch via email
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International Research
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Availability of sampling frames varies dramatically around the world
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Sampling Unit
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A single element or group of elements subject to selection in the sample
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Primary Sampling Unit (PSU)
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A unit selected in the first stage of sampling
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Secondary Sampling Unit
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A unit selected in the second stage of sampling
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Tertiary Sampling Unit
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A unit selected in the third stage of sampling
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Random Sampling Error
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The difference between the sample results and the results of a census conducted using identical procedures
A statistical fluction that occcurs because of chance variations in the elements selected for sample |
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Systematic Sampling Error
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Nonsampling error results from nonsampling factors, primarly the nature of a study's design and the correctness of exectuion
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Quota Sampling
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Ensures that various subgroups of a population will be represnted on pertient characteristics to the exact extent that the investigator desires
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Possible sources of bias:
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Similar to interviewer
Easily Found Willing to be interviewed Middle Class |
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Snowball Sampling
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A sampling procedure in which initial respondents are selected by porbability methods and additional respondents are obtained from information provided by the initial respondents
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Simple Random Sampling
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Assures each element in the population of an equal chance of being included in the sample
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Systematic Sampling
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A starting point is selcted by a random process and than every nth number on the list is selcted
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Stratified Sampling
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Simple Random Subsamples that are more or less equal on some characteristic are drawn from within each stratum of the population
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Proportional Stratified Sample
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If the number of sampling units drawn from each stratum is in proporiton to the relative population size of the stratum
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Cluster Sampling
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an economically efficient sampling technique in which the primary sampling unit is not the indivdiual element in the population but a larger cluster of elements
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Multistage Area Sampling
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Involves using a combination of two or more probability sampling techniques
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