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Environmental Monitoring and Assessment

, Volume 26, Issue 1, pp 65–83 | Cite as

Using ‘found’ data to augment a probability sample: Procedure and case study

  • J. C. Mc Overton
  • T. C. Young
  • W. S. Overton
Article

Abstract

While probability sampling has the advantage of permitting unbiased population estimates, many past and existing monitoring schemes do not employ probability sampling. We describe and demonstrate a general procedure for augmenting an existing probability sample with data from nonprobability-based surveys (‘found’ data). The procedure, first proposed by Overton (1990), uses sampling frame attributes to group the probability and found samples into similar subsets. Subsequently, this similarity is assumed to reflect the representativeness of the found sample for the matching subpopulation. Two methods of establishing similarity and producing estimates are described: pseudo-random and calibration. The pseudo-random method is used when the found sample can contribute additional information on variables already measured for the probability sample, thus increasing the effective sample size. The calibration method is used when the found sample contributes information that is unique to the found observations. For either approach, the found sample data yield observations that are treated as a probability sample, and population estimates are made according to a probability estimation protocol. To demonstrate these approaches, we applied them to found and probability samples of stream discharge data for the southeastern US.

Keywords

Environmental Management General Procedure Discharge Data Sampling Frame Probability Estimation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Messer, J.J., Ariss, C.W., Baker, J.R., Drouse, S.K., Eshleman, K.N., Kaufmann, P.R., Linthurst, R.A., Omernik, J.M., Overton, W.S., Sale, M.J., Schonbrod, R.D., Stambaugh, S.M. and Tuschall, J.R. Jr.: 1986, ‘National Surface Water Survey: National Stream Survey Phase I — Pilot Survey’, EPA/600/4-86/026. U.S. Environmental Protection Agency, Office of Research and Development, Washington DC.Google Scholar
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Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • J. C. Mc Overton
    • 1
  • T. C. Young
    • 2
  • W. S. Overton
    • 3
  1. 1.Biology DepartmentUCLALos AngelesUSA
  2. 2.Department of Civil and Environmental EngineeringClarkson UniversityPotsdamUSA
  3. 3.Department of StatisticsOregon State UniversityCorvallisUSA

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