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1、?34?9?Vol.34, No.92014?9?Systems Engineering Theory O212.4?: ACVM?,?,?,?(?,?150030)?(CVM)?.?CVM?,?(WTP)?,?WTP,?.?,?CVM?,?,?CVM?.?,?90.53?/?/?,?.?CVM?.?(CVM);?; COX?;?;?The semi-parametric model and empirical research in CVMAO Chang-lin, WANG Jing, GAO Qin, CHEN Hong-guang(Department of Management Sc
2、ience and Engineering, Northeast Agricultural University, Harbin 150030, China)Abstract The contingent valuation method (CVM) is a availably, flexible non-market valuation method which is widely used to evaluate the environmental goods, especially the landscape evaluation. The doublebounded dichotom
3、ous choice is the most effective format of contingent valuation models except that it can not provide a direct estimate of the willingness to pay (WTP) and its parameter model can notfully fit the WTP as well as exploit the sample data information.This research provides a new path by addressing an a
4、nalysis method of the CVM based on survival analysis and builds a semi-parametric proportional hazards model to analyse the impact factors of willingness to pay. Taking Sanjiang plain wetland landscape evaluation as an example, the willingness to pay of Sanjiang wetland landscape is RMB 90.53 per ye
5、ar. Individual average annual income, educational background, respondents location and theattitudes to environment protect are the main risk factors which affect the willingness to pay. This researchshows the feasibility and effectiveness of the semi-parametric analysis methods to deal with the data
6、 of dichotomous choice CVM.Keywordscontingent valuation method (CVM); survival analysis; COX proportional hazard model; Sanjiang Plain; landscape value1?(CVM)?,?,?12.CVM?,?Hicks?3.?CVM?(WTP)?(WTA),?.?:?,?. Hoehn?,?4,?: 2012-12-27?:?(71171044);?(2013M531012);?(13DJJJ01)?:?(1964),?,?,?,?,?,?:?, E-mail
7、: ;?(1988),?,?,?,?,?:?.?9?,?: CVM?2333?,?“?”.?,?“?”? “?”?,?.?NOAA?CVM?CVM?5.?CVM?6?79?.?,?CVM?10,?11.?CVM?,?CVM?,?1213?.?WTP?,?,?.?CVM?,? CVM?1415,?1617?.?CVM?,?1820.?.?CVM?,?CVM?2,?WTP21.?,?CVM?,?,?22.?23?,?.?,?2425,?CVM?WTP?,?CVM?.?WTP?,?WTP?,?WTP?.?,?,?.2?26,?.?,?.?.2.1 WTP?CVM?,?WTP?“?”,?,?,?,?“
8、?”,?“?”.?,?,?,?“?”,?“?”.?“?”?“?”?.?,?,?“?”?“?”.?:?T?“?”,?TU,?TL.?,?4?: “?-?”?“?-?”?“?-?”?“?-?”,?YY?YN?NY?NN.?WTP?,?,?1?. 2.2 WTP? 2.2.1 COX?h(t)?:h(t) = lim t0P(t t) t= h(t,x)(1)?, T?, x?, ?. COX?,?h(t)?:?1?CVM?-?WTPTU?-?TWTP ti?.?COX?:L() =n?i=1?h0(t)exp(1xi1+ 2xi2+ + mxim)?S?R(ti)h0(t)exp(1xs1+ 2x
9、s2+ + mxsm)?i (4)?ti?H0(t)?:ln?h(t,X)h0t? = 1x1+ 2x2+ + mxm(5)?S0(t)?H0(t)?:S0(t) = expH0(ti)(6)?:S(t;X) = S0(t)exp(1x1+ 2x2+ + mxm) = h(t,x)(7)?, S0(t)?t?, x?, ?. 2.2.2 CVM?CVM?WTP?,?WTP?COX?.?CVM?,?h(A)?:h(A) =lim A0P(A A) A= h(A,x)(8)?: A?, x?, ?. WTP?:h(wtp) = h0(wtp)exp(1x1+ 2x2+ + mxm)(9)?: h0(wtp)?WTP?, x?WTP?, ?, m?.?CVM?:L() =n?i=1?h0(wtp)exp(1xi1+ 2xi2+ + mxim)?S?R(Ai)h0(wtp)exp(1xs1+ 2xs2+ + mxsm)?i (10)?,?WTP?A,?A + A,?“?”?,?i= 0, “?”?,?i= 1.?L()?j?.?, xj?
