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Testing and Correcting for Sample Selection Bias in Discrete Choice Contingent Valuation Studies

Listed author(s):
  • Eklöf, Jan


    (Department of Economic Statistics)

  • Karlsson, Sune


    (Department of Economic Statistics)

The discrete choice or ”referendum” contingent valuation technique has become a popular tool for assessing the value of non-market goods. Surveys used in these studies frequently suffer from large non-response which can lead to significant bias in parameter estimates and in the estimate of mean Willingness to Pay. We investigate the properties of tests for sample selection bias and the losses made by applying estimators assuming no sample selection. The effects of sample selection bias can be sizable but bivariate probit estimation give unbiased estimates. A computationally straightforward test for sample selection bias is found to perform well.

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Paper provided by Stockholm School of Economics in its series SSE/EFI Working Paper Series in Economics and Finance with number 171.

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Length: 38 pages
Date of creation: May 1997
Date of revision: 23 Jun 1999
Handle: RePEc:hhs:hastef:0171
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