The standard static model of the e¤ect of welfare program participation on labor supply is estimated allowing the e¤ect of participation to be heterogeneous in the population and allowing the program participation decision to be endogenous and to exhibit incomplete takeup. A reduced form model is estimated with nonparametric methods to determine the distribution of the marginal treatment e¤ect ...

This paper sheds some light on the problems associated with random effects gravity approaches. Arguments for the superiority of a fixed effects model are given both along intuitive and econometric lines based on a Hausman test.  2000 Elsevier Science S.A. All rights reserved.

For static panel data models that include endogenous time-invariant variables correlated with individual effects, exogenous averages over time of time-varying can be internal instruments. To pretest their exogeneity, we first estimate a random effects model includes all (Mundlak, 1978; Krishnakumar, 2006). Internal instruments are then selected if parameter is statistically different from zero ...

Keyword: Quantile regression, endogeneity test, Hausman test. Mots clé de la conférence: Econométrie, Modèles semi et non paramétriques Abstract: In this paper we develop a test to detect the presence of endogeneity in di¤erent quantiles in the conditional distribution of a variable of interest. This Hausman test type is based on one estimator consistent only under no endogeneity at the examine...

Editor’s Note: In addition to this interview, you can find several resources regarding this study at www.acupuncturetoday.com, including a PDF of the Australian study published in JAMA, an article in response to the flaws seen in this study, the Letter to the Editor of JAMA referenced in this interview and a complaint letter from the Traditional Chinese Medicine American Alumni Association (TCM...

Labour Productivity in the British and South Wales Coal Industry, 1874-1914 Author(s): Barry T. Hirsch and William J. Hausman Reviewed work(s): Source: Economica, New Series, Vol. 50, No. 198 (May, 1983), pp. 145-157 Published by: Blackwell Publishing on behalf of The London School of Economics and Political Science and The Suntory and Toyota International Centres for Economics and Related Disc...

This paper considers specification testing for instrumental variables estimation in the presence of many instruments. The test is similar to the overidentifying restrictions test of Sargan (1958) but the test statistic asymptotically follows the standard normal distribution under the null hypothesis when the number of instruments is proportional to the sample size. It turns out that the new tes...

1Center for Applied Health Research, Baylor Scott & White Health | School of Public Health, Texas A&M Health Science Center, College Station. 2Department of Human Development and Family Studies, Iowa State University, Ames. 3Institute of Gerontology, University of Georgia, Athens. 4Georgia Centenarian Study group included Maurice MacDonald, S. Michal Jazwinski, Robert C. Green, Marla Gearing, W...