Abstract
This paper proposes a novel way of modeling heterogeneity in the context of environmental performance estimation when using Data Envelopment Analysis. In the recent literature estimation of productive efficiency is common and relies on inputs and outputs identifying an environmental production technology in cases of joint production of good and bad outputs. However, heterogeneity is an important issue in this context. Our proposed novel approach relies on identification of different groups using a multivariate mixture-of-normals-distribution. The new techniques are applied to a data set of 44 countries during 1996–2014 concerning the finance of environmental efforts where significant problems of heterogeneity both in cross-sectional as well as in the time dimension are anticipated. For this purpose, apart from the usual variables of the production function, proxies of environmental investments like renewable electricity output and research and development expenditures are used. The sampling properties of the new approach are investigated using a Monte Carlo experiment. The problem of structural breaks over time is also considered with a penalty term in local likelihood estimation.
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For instance, Cincotti et al. (2008) discuss heterogeneity in financial economics and Yu and Choi (2015) measure environmental performance under regional heterogeneity in China. Various applications may find useful the proposed tackling of heterogeneity in natural disasters and inclusive wealth (Rajapaksa et al. 2017; Sato et al. 2018) or in mineral resources (Tamaki et al. 2018).
The asymptotic behavior of the estimator is provided in Theorem 2.2 of Kumbhakar et al. (2007) under certain general regularity conditions. The initial conditions needed in optimizations, are chosen using the procedure described in section 3.1 of Kumbhakar et al. (2007) in connection to Gozalo and Linton (2000). To implement the computation, we used the FilterSD software in fortran77.
We discard data sets in which our optimizations did not converge in 1000 steps. This happened in about 25 data sets.
The countries considered are the ones with full record on the variables of interest: Argentina, Australia, Austria, Belgium, Bulgaria, Brazil, Canada, China, Colombia, Czech Republic, Germany, Denmark, Ecuador, Spain, Estonia, Finland, France, United Kingdom, Greece, Croatia, Hungary, Ireland, Iceland, Italy, Japan, South Korea, Lithuania, Latvia, Mexico, Netherlands, Norway, Panama, Poland, Portugal, Romania, Russian Federation, Singapore, Slovak Republic, Slovenia, Sweden, Thailand, Turkey, United States of America, South Africa.
Data were obtained from: http://data.worldbank.org/.
For the recent status on ratifications see http://unfccc.int/paris_agreement/items/9444.php.
Annex I and Annex B are developed signatory nations of Kyoto Protocol subject to GHG emissions’ limits and obliged to reduction targets. While Annex I countries are classified for reduction in the United Nations Framework Convention on Climate Change (UNFCCC), Annex B countries are identified under the more recent Kyoto Protocol with reduction targets officially stated.
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Acknowledgements
We would like to thank the Editor Professor Hans Amman and three anonymous reviewers for the comments provided in relation to an earlier version of our paper. Any remaining errors are solely the authors’ responsibility.
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Halkos, G., Tsionas, M.G. Accounting for Heterogeneity in Environmental Performance Using Data Envelopment Analysis. Comput Econ 54, 1005–1025 (2019). https://doi.org/10.1007/s10614-018-9861-2
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DOI: https://doi.org/10.1007/s10614-018-9861-2
Keywords
- Environmental performance
- Heterogeneity
- Production
- Data Envelopment Analysis
- Multivariate-mixture-of-normals-distributions