English, Article, Journal or magazine article edition: Constructing Krinsky and Robb Confidence Interval for Mean and Median WTP Using Stata P. Wilner Jeanty

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Physical Description
  • preprint
Language
  • English

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Title
  • Constructing Krinsky and Robb Confidence Interval for Mean and Median WTP Using Stata
Author
  • P. Wilner Jeanty
Physical Description
  • preprint
Notes
  • The ultimate goal of most non-market valuation studies is to obtain welfare measures i.e. mean and/​or median willingness to pay (WTP) and confidence intervals. While the delta (nlcom) and bootstrap (bs) methods can be used for constructing such confidence intervals in Stata, they are not recommended because WTP measures are non-linear functions of random parameters (Creel and Loomis, 1991). The best and widely used approach, which is not available in Stata, consists in simulating the confidence intervals using the Krinsky and Robb procedure (Haab and McConnell, 2002). Hole (2007) has recently introduced a useful command, wtp, which implements the Krinsky and Robb procedure in Stata, but does not feature mean and median WTP estimates and their confidence intervals. I present a Stata command, wtpcikr, which computes mean and median WTP, confidence intervals using the Krinsky and Robb procedure, achieved significance level (ASL) for testing the null hypothesis that WTP equals zero, and a relative efficiency measure (Loomis and Ekstrand, 1998). The command supports both linear and exponential contingent valuation models estimated with or without covariates using the Stata commands probit, logit, biprobit, and xtprobit. I will illustrate the use of wtpcikr by replicating empirical results in Haab and McConnell (2002).
  • RePEc:boc:asug07:8
Language
  • English
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