Allan H. Würtz

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The cost of producing the same good often differs substantially for public and private producers. We investigate the effect of organization in a case where the production technology is simple: The cleaning of Danish schools. Three forms of organization are used: Decentral municipal, central municipal or private. For small schools the organizational form has(More)
It is demonstrated that the now well-established "flip-flop" mechanism of spin exchange between electrons and nuclei in the quantum Hall effect can be reversed. We use a sample geometry which utilizes separately contacted edge states to establish a local nuclear spin polarization--close to the maximum value achievable--by driving a current between electron(More)
This paper will introduce a new dimensionality reduction technique based on the ideas behind principal components analysis and the least absolute deviations estimator. We show that this technique can be used to obtain robust estimates of diffusion indexes for use in macroeconomic forecasting, thus eliminating the need to screen the data for outliers(More)
In developed countries, immigrants are more likely to be non-employed and self-employed compared to natives. Based on register data of male immigrants in Denmark, we perform a detailed investigation of the immigrant-native difference in transition patterns across labor market states. We find that a high proportion of immigrants from non-western countries(More)
This paper investigates the finite sample performance of three semiparametric estimators of the Box-Cox model. Two of the semiparametric estimators are the nonlinear two-stage least squares (NL2SLS) estimator proposed by Amemiya and Powell (1981) and a rescaled version (RNL2SLS) proposed by Powell (1996) to eliminate an inconsistent minimizer of the NL2SLS(More)
N.E. Savin, Henry B. Tippie College of Business, Department of Economics, University of Iowa, 108 John Pappajohn Business Bldg., Iowa City, IA 52242-1000. Tel: (319) 335-0855, FAX (319) 335-1956, gene-savin@uiowa.edu. Allan H. Würtz, Department of Economics, University of Aarhus, Building 350, DK 8000 Aarhus C, Denmark. Tel: 45-8942-1507; FAX:45-8613-6334(More)
This paper develops a specification test for functional form for models identified by moment restrictions, including IV and GMM settings. The general framework is one where the moment restrictions are specified as functions of data, a finite-dimensional parameter vector, and a nonparametric real function (an infinite-dimensional parameter vector). The null(More)
N.E. Savin, Henry B. Tippie College of Business, Department of Economics, University of Iowa, 108 John Pappajohn Business Bldg., Iowa City, IA 52242-1000. Tel: (319) 335-0855, FAX (319) 335-1956, gene-savin@uiowa.edu. Allan H. Würtz, Department of Economics, University of Aarhus, Building 322, DK 8000 Aarhus C, Denmark and Center for Applied Microeconomics.(More)
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