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<table width="100%" summary="page for NaturalPark"><tr><td>NaturalPark</td><td align="right">R Documentation</td></tr></table>

<h2>Willingness to Pay for the Preservation of the Alentejo Natural Park </h2>

<h3>Description</h3>


<p>a cross-section from 1987
</p>
<p><EM>number of observations</EM> :  312
</p>
<p><EM>observation</EM> :  individuals
</p>
<p><EM>country</EM> :  Portugal
</p>


<h3>Usage</h3>

<pre>data(NaturalPark)</pre>


<h3>Format</h3>

<p>A dataframe containing :
</p>

<dl>
<dt>bid1</dt><dd><p>initial bid, in euro</p>
</dd>
<dt>bidh</dt><dd><p>higher bid</p>
</dd>
<dt>bidl</dt><dd><p>lower bid</p>
</dd>
<dt>answers</dt><dd><p>a factor with levels (nn,ny,yn,yy)</p>
</dd>
<dt>age</dt><dd><p>age in 6 classes</p>
</dd>
<dt>sex</dt><dd><p>a factor with levels (male,female) </p>
</dd>
<dt>income</dt><dd><p>income in 8 classes</p>
</dd>
</dl>



<h3>Source</h3>


<p>Nunes, Paulo (2000) <EM>Contingent Valuation of the Benefits of natural areas and its warmglow component</EM>, PhD thesis 133, FETEW, KULeuven.
</p>


<h3>References</h3>


<p>Verbeek, Marno (2004) <EM>A guide to modern econometrics</EM>, John Wiley and Sons, <a href="http://www.econ.kuleuven.ac.be/GME">http://www.econ.kuleuven.ac.be/GME</a>, chapter 7.
</p>


<h3>See Also</h3>

<p><code>Index.Source</code>, <code>Index.Economics</code>, <code>Index.Econometrics</code>, <code>Index.Observations</code></p>


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