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A simple random sample in an area frame usually gives a number of pairs of elements that are close to each other. These elements give redundant information since there is usually a high spatial autocorrelation at short distances. The efficiency of sampling is generally improved if the distance between two elements of the sample cannot be less than a certain threshold. However, applying this restriction can introduce a significant perturbation of the sampling probability, since elements near the borders of the region are more likely to be selected. In the case of aligned sampling by repetition of a pattern in a squared block, a distance threshold does not modify the marginal probability of each element of the population, although crossed probabilities are slightly changed.

Additional information

Authors: FUENTES M, University of Chicago, Department of Statistics (US);GALLEGO F J, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Applied Statistics in Agriculture, Manhattan (US), April 23-25, 1995
Availability: Available from (1) as Paper EN 39277 ORA
Record Number: 199511467 / Last updated on: 1995-11-03
Original language: en
Available languages: en
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