Learn More
This paper reviews econometric methods for dynamic panel data models, and presents examples that illustrate the use of these procedures. The focus is on panels where a large number of individuals or firms are observed for a small number of time periods, typical of applications with microeconomic data. The emphasis is on single equation models with(More)
Note : The Discussion Papers in this series are prepared by members of the Department of Economics, University of Essex, for private circulation to interested readers. They often represent preliminary reports on work in progress and should therefore be neither quoted nor referred to in published work without the written consent of the author. Abstract(More)
This study uses microeconomic data to estimate the size of the CPI bias due to retail outlet substitution. The estimated value for the bias is slightly higher than what is reported in studies carried out in other countries, but it is declining. This difference is explained by the important changes in the selling circuits that occurred in Portugal over the(More)
Note : The Discussion Papers in this series are prepared by members of the Department of Economics, University of Essex, for private circulation to interested readers. They often represent preliminary reports on work in progress and should therefore be neither quoted nor referred to in published work without the written consent of the author. Abstract We(More)
We critically review the recent literature on currency unions, and discuss the methodological challenges posed by the empirical assessment of their costs and benefits. In the process, we provide evidence on the economic effects of the euro. In particular, and in contrast with estimates of the trade effect of other currency unions, we find that the impact of(More)
This paper elaborates on the alternative measure of persistence recently suggested in Marques (2004), which is based on the idea of mean reversion. A formal distinction between γ , the unconditional probability of a given process not crossing its mean in period t and $ γ , its estimator, is made clear and the relationship between γ and , the widely used "(More)
Modern deep sub-micron ULSI designs with hundreds of millions of devices require huge grids for power distribution. Such grids, operating with increasingly low-power voltages, are a design limiting factor and accurate analysis of their behavior is of paramount importance as any voltage drops can seriously impact performance or functionality. As power grid(More)
Much of the empirical analysis done by health economists seeks to estimate the impact of specific health policies and the greatest challenge for successful applied work is to find appropriate sources of variation to identify the treatment effects of interest. Estimation can be prone to selection bias, when the assignment to treatments is associated with the(More)
Modern deep sub-micron ultra-large scale integration designs with hundreds of millions of devices require huge grids for power distribution. Such grids, operating with decreasing power supply voltages, are a design limiting factor and accurate analysis of their behavior is of paramount importance as any voltage drops can seriously impact performance or(More)