help singleb
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Title

    singleb --    Contingent Valuation using Single-Bounded Dichotomous
                   Choice


Syntax

        singleb varlist [if] [in] [weight] [, level(#) noconstant]


Description

    This command uses maximum likelihood (under the assumption of normality)
    to estimate the single-bounded dichotomous choice model for contingent
    valuation (Cameron and James, 1987). This command provides an alternative
    to the estimation via probit.  The main advantage of this procedure is
    that we directly obtain point estimates (and standard errors) of the
    marginal effect that a change in the explanatory variable has on WTP.

Remarks

    The first variable in varlist should be the bid variable. The second
    variable should be the dummy for the response to the dichotomous choice
    question. The remaining variables will be interpreted as covariates or
    control variables.

    For the constant only model the constant represents the mean WTP. For the
    model with explanatory variables the mean WTP can be obtained by
    multiplying the mean vector of explanatory variables by the vector of
    estimated coefficients.

Examples

        . singleb bid response

        . singleb bid response x1 x2

    Use file singleb.dta to do the examples


Author

    Alejandro Lopez-Feldman
    Centro de Investigacion y Docencia Economicas, CIDE
    Email:  lopezfeldman@gmail.com


References

    Cameron, T. and M. James. 1987. Estimation Methods for "Closed-Ended"
        Contingent Valuation Surveys. Review of Economics and Statistics 69:
        269-276.



Acknowledgments

    I thank Brett Day for sharing the Stata code that helped me to get