Template-Type: ReDIF-Paper 1.0
Author-Name: Mette Asmild
Author-Name-First: Mette
Author-Name-Last: Asmild
Author-Email: meas@ifro.ku.dk
Author-Workplace-Name: Department of Food and Resource Economics, University of Copenhagen
Author-Name: Dorte Kronborg
Author-Name-First: Dorte
Author-Name-Last: Kronborg
Author-Email: dk.mes@cbs.dk
Author-Workplace-Name: Center for Statistics, Department of Finance, Copenhagen Business School
Author-Name: Anders Rønn-Nielsen
Author-Name-First: Anders
Author-Name-Last: Rønn-Nielsen
Author-Email: aro.fi@cbs.dk
Author-Workplace-Name: Center for Statistics, Department of Finance, Copenhagen Business School
Title: Testing productivity change, frontier shift, and efficiency change
Abstract: Inference about productivity change over time based on data envelopment (DEA) has focused primarily on the Malmquist index and is based on asymptotic properties of the index. In this paper we propose a novel set of significance tests for DEA based productivity change measures based on permutations and accounting for the inherent correlations when panel data are observed. The tests are easily implementable and give exact significance probabilities as they are not based on asymptotic properties. Tests are formulated both for the geometric means of the Malmquist index, and also of its components, i.e. the frontier shift index and the eciency change index, which together enable analysis of not only the presence of differences, but also gives an indication of whether the productivity change is due to shifts in the frontiers and/or changes in the efficiency distributions. Simulation results show the power of, and suggest how to interpret the results of, the proposed tests. Finally, the tests are illustrated using a data set from the literature.
Length: 23 pages
Creation-Date: 2018-06
File-URL: http://okonomi.foi.dk/workingpapers/WPpdf/WP2018/IFRO_WP_2018_07.pdf
File-Format: Application/pdf
Number: 2018/07
Classification-JEL: C12, C14, C44, C46, C61, D24
Keywords: Malmquist index, frontier shift, efficiency change, Data Envelopment Analysis (DEA), panel data, permutation tests, inference.
Handle: RePEc:foi:wpaper:2018_07