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Reducing systematic and random errors in on-site data: theory and empirical results of a survey among forest visitors in Zurich



Reducing systematic and random errors in on-site data: theory and empirical results of a survey among forest visitors in Zurich



Allgemeine Forst und Jagdzeitung 178(5/6): 109-120



Visitor surveys are widely used to collect information on recreational uses of forests and to estimate recreational values. If visitors are sampled on-site, their selection probabilities depend on external factors and differ, for example, according to visit frequencies. These inequalities are compensated with weights which are inversely proportional to selection probabilities.

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