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From |
"Carlo Lazzaro" <carlo.lazzaro@tin.it> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: R: not quite double bounded CV |

Date |
Sat, 24 May 2008 09:51:19 +0200 |

Dear Coba, I suppose you are referring to the bidding games starting-point bias in Willingness-To-Pay (WTP) studies (please, see O'Brien B, Viramontes JL. Willingness To Pay: A Valid and Reliable Measure of Health State Preferences? Med Decis Making 1994; 14: 289-297). In this article, chronic lung disease patients were randomly assigned to one of five starting bids ($10; $25; $50; $75; $100)intended to elicit the maximum WTP for expected health outcomes. Authors addressed the starting-point bias issue via an Income-Controlled Analysis of Covariance (ANCOVA), which highlighted the relationship between Maximum WTP and Staring Bid (Table 5; p. 295). Sorry I cannot be more helpful as far as Stata commands are concerned. Kind Regards and enjoy your W-E, Carlo -----Messaggio originale----- Da: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Jacoba van der Gaag Inviato: sabato 24 maggio 2008 8.46 A: statalist@hsphsun2.harvard.edu Oggetto: st: not quite double bounded CV Hi, I have a survey on willingness to pay for health insurance that takes the following form: respondents are first asked if they are willing to pay an Amount A, if they say yes, questioning stops, if they say no, they are offered a lower Amount B. They say either yes or no to Amount B and then questioning stops. So there are three possible outcomes: Yes; No-Yes; No-No. I would like to run an ordered logit or ordered probit model where these outcomes make up the independent variable. To complicate things, there are 4 possible starting values of Amount A.. Each respondent is randomly assigned one of the values. My question is how can I take into account that there are different values of Amount A (and subsequently B)? Is it to do with groups? Or do I need to write a program? As you can no doubt guess, my experience with this is quite limited, so any information at all would be greatly appreciated. Thanks! Coba * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: not quite double bounded CV***From:*"Jacoba van der Gaag" <jacoba.vandergaag@gmail.com>

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