NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

NBER Publications by Omar Galarraga

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Working Papers and Chapters

October 2007Heterogeneous Impact of the "Seguro Popular" Program on the Utilization of Obstetrical Services in Mexico, 2001-2006: A Multinomial Probit Model with a Discrete Endogenous Variable
with Sandra G. Sosa-Rubi, Jeffrey E. Harris: w13498
Objective: We evaluated the impact of Seguro Popular (SP), a program introduced in 2001 in Mexico primarily to finance health care for the poor. We studied the effect of SP on pregnant women's access to obstetrical services. Data: We analyzed the cross-sectional 2006 National Health and Nutrition Survey (ENSANUT), focusing on the responses of 3,890 women who delivered babies during 2001-2006 and whose households lacked employer-based health care coverage. Methods: We formulated a multinomial probit model that distinguished between three mutually exclusive sites for delivering a baby: a health unit accredited by SP; a clinic run by the Department of Health (Secretaria de Salud, or SSA); and private obstetrical care. Our model accounted for the endogeneity of the household's binary decis...
October 2006An Instrumental Variable Evaluation of Antidepressant Use on Employment Among HIV-Infected Women Using Highly-Active Antiretroviral Therapy in the United States: 1996-2004
with David S. Salkever, Judith A. Cook, Stephen J. Gange: w12619
This paper examines the effect of antidepressant use on the likelihood of being employed among HIV-positive women receiving highly active antiretroviral therapy (HAART) in the United States from 1994 to 2004. We use instrumental variables to predict antidepressant use independently of outcomes; thus, addressing potential sources of bias -- more depressed women are more likely to receive antidepressant treatment, but they are also more likely to be unemployed. The results show that antidepressant use has a positive effect on the employment probability of women living with HIV. The proposed instrumental variables can be used to identify antidepressant use in the WIHS population. Among women receiving HAART, and controlling for individual and local area labor market characteristics, the u...

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