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| Somerville   | R Documentation   |
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Visits to Lake Somerville
-------------------------

Description
~~~~~~~~~~~

a cross-section from 1980

*number of observations* : 659

*observation* : individuals

*country* : United States

Usage
~~~~~

::

    data(Somerville)

Format
~~~~~~

A dataframe containing :

visits
    annual number of visits to lake Somerville

quality
    quality ranking score for lake Somerville

ski
    engaged in water–skiing at the lake ?

income
    annual household income

feeSom
    annual user fee paid at lake Somerville ?

costCon
    expenditures when visiting lake Conroe

costSom
    expenditures when visiting lake Somerville

costHoust
    expenditures when visiting lake Houston

Source
~~~~~~

Seller, Christine, John R. Stoll and Jean–Paul Chavas (1985) “Valuation
of empirical measures of welfare change : a comparison of nonmarket
techniques”, *Land Economics*, **61(2)**, may, 156–175.

Gurmu, Shiferaw and Pravin K. Trivedi (1996) “ Excess zeros in count
models for recreational trips”, *Journal of Business and Economics
Statistics*, **14(4)**, october, 469–477.

Santos Silva, Jao M. C. (2001) “A score test for non–nested hypotheses
with applications to discrete data models”, *Journal of Applied
Econometrics*, **16(5)**, 577–597.

References
~~~~~~~~~~

Journal of Business Economics and Statistics web site :
`http://www.amstat.org/publications/jbes/ <http://www.amstat.org/publications/jbes/>`_.
Cameron, A.C. and Trivedi P.K. (1998) *Regression analysis of count
data*, Cambridge University Press,
`http://cameron.econ.ucdavis.edu/racd/racddata.html <http://cameron.econ.ucdavis.edu/racd/racddata.html>`_,
chapter 6.

See Also
~~~~~~~~

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