Frank Windmeijer and Joao Santos Silva, "Endogeneity in Count Data
Models: An Application to Demand for Health Care", Journal of Applied
Econometrics, Vol. 12, No. 3, 1997, pp. 281-294.

   The data are taken from the British Health and Lifestyle Survey
(1991-1992) (HALS2). 

   The Data Archive does not allow us to provide the dataset to others.
Anyone interested in the data should therefore contact : 

    The Data Archive
    University of Essex
    Wivenhoe Park
    Colchester, Essex
    CO4 3SQ
    UK

    Phone :  +44.(0)1206.872001
    Fax :    +44.(0)1206.872003
    Email:   archive@essex.ac.uk
    http://www.dawww.essex.ac.uk