منابع مشابه
Sampling Strategy for Agriculture Censuses and Surveys in Developing Countries
Full enumeration agriculture censuses have become less feasible financially and operationally in many developing countries. They had not always lived up to their promise to serve as frame for the intercensal surveys and to provide reasonably accurate benchmark data for small areas. Observed large deviations between the survey and census results point to serious non-sampling errors especially in...
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This chapter is a comprehensive overview of sampling methods for web and e-mail (‘Internetbased’) surveys. It reviews the various types of sampling method – both probability and nonprobability – and examines their applicability to Internet-based surveys. Issues related to Internetbased survey sampling are discussed, including difficulties assembling sampling frames for probability sampling, cov...
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Web surveys are frequently based on samples drawn from panels with large amounts of nonresponse or haphazard selection. The availability of large-scale consumer and voter databases provides large amounts of auxilliary information for both panelists and population members. Sample matching, where a conventional random sample is selected from a population frame and the closest matching respondent ...
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Underwater visual census (UVC) is the most common approach for estimating diversity, abundance and size of reef fishes in shallow and clear waters. Abundance estimation through UVC is particularly problematic in species occurring at low densities and/or highly aggregated because of their high variability at both spatial and temporal scales. The statistical power of experiments involving UVC tec...
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ژورنال
عنوان ژورنال: Economic Geography
سال: 1950
ISSN: 0013-0095
DOI: 10.2307/141714