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                            what-is-a-survey.pdf
                            by F Scheuren Cited by 494 A sampling frame can also consist of geographic areas with well-defined natural or artificial boundaries, when no suitable population list exists (as might be
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                            Overview of the Sampling Design and Statistical Methods 
                            In 1999, over 8 million telephone call attempts were made to obtain provider- reported vaccination histories on 22,521 children in the age range of interest.
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