The discussion about the bias due to input (or output) aggregation in efficiency measurement based on data envelopment analysis, recently revisited by Tauer (2001) and Fare and Zelenyuk (2002) is continued. Attention is focused on the direction and the bounds of the aggregation bias.

This note shows that the Nerlovian profit indicator may be aggregated over firms into an industry measure of profit efficiency. The note also provides conditions under which the technical component of the indicator may also be aggregated.

This paper defines the notion of unbiased aggregation of inputs and provides a necessary and sufficient condition for this to apply.

In this note we investigate the power of significance test for dummy variables in the context of Simar and Wilson (2007) two-stage efficiency analysis model.

This paper investigates the Abrams curve, that is the relationship between government size and unemployment, for 10 European countries over the period 1961-1999. This paper uses credible causality inferences that do not depend on the stationarity or cointegration properties of the data. The...

In this article, we employ a number of econometric techniques in order to examine, on a quarterly basis, the transmission of fluctuations between the Greek and the other economic and monetary union (EMU) countries, respectively, after the introduction of the common currency in the period...