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Improving Statistical Efficiency and Testing Robustness of Conjoint Marginal Valuations

Michelle A. Haefele and John Loomis

American Journal of Agricultural Economics, 2001, vol. 83, issue 5, 1321-1327

Abstract: We investigate the effect of panelestimators and sample weighting to improve efficiency of coefficient estimates and confidence intervals on marginal values. Panel estimators are appropriate because most conjoint studies have respondents rate multiple product profiles. Using a random effects ordered probit model increases significance levels on two forest health attribute coefficients and results in substantial tightening of confidence intervals on marginal values. To mitigate the effects of low response rate, we weight the returned surveys using Census data to match the sample to the population. Two of the four marginal values from this weighted ordered probit model are substantially different. Copyright 2001, Oxford University Press.

Date: 2001
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American Journal of Agricultural Economics is currently edited by Madhu Khanna, Brian E. Roe, James Vercammen and JunJie Wu

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