+---------------+-------------------+
| NaturalPark   | R Documentation   |
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Willingness to Pay for the Preservation of the Alentejo Natural Park
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Description
~~~~~~~~~~~

a cross-section from 1987

*number of observations* : 312

*observation* : individuals

*country* : Portugal

Usage
~~~~~

::

    data(NaturalPark)

Format
~~~~~~

A dataframe containing :

bid1
    initial bid, in euro

bidh
    higher bid

bidl
    lower bid

answers
    a factor with levels (nn,ny,yn,yy)

age
    age in 6 classes

sex
    a factor with levels (male,female)

income
    income in 8 classes

Source
~~~~~~

Nunes, Paulo (2000) *Contingent Valuation of the Benefits of natural
areas and its warmglow component*, PhD thesis 133, FETEW, KULeuven.

References
~~~~~~~~~~

Verbeek, Marno (2004) *A guide to modern econometrics*, John Wiley and
Sons,
`http://www.econ.kuleuven.ac.be/GME <http://www.econ.kuleuven.ac.be/GME>`_,
chapter 7.

See Also
~~~~~~~~

``Index.Source``, ``Index.Economics``, ``Index.Econometrics``,
``Index.Observations``
