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Using a spike model to deal with zero response data from double bounded dichotomous choice contingent valuation surveys  Authors: Seung-Hoon Yoo ;Seung-Jun Kwak
Published in: Applied Economics Letters, Volume 9, Issue 14 November 2002 , pages 929 - 932

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Modelling willingness to pay responses from dichotomous choice contingent valuation surveys with zero observations  Authors: Seung-Hoon Yoo ; Seung-Jun Kwak ;Tai-Yoo Kim
Published in: Applied Economics, Volume 33, Issue 4 March 2001 , pages 523 - 529
[url=http://www.informaworld.com/smpp ... ~fulltext=713240930]URL: http://www.informaworld.com/smpp ... ~fulltext=713240930[/url]

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