The non-differentiability and implicit definition of boundary of production possibility set (PPS) in data envelopment analysis (DEA) are two important difficulties for obtaining directional characteristics, including different elasticity measures and marginal rates of substitution. Also, imposing weight restrictions in DEA models have some shortcomings and misunderstandings. In this paper we ut...

unemployment-inflation trade-off is known as philips curve. this relationship was first defined for england economy by professor philips since 1958. much development has been submitted by different economic schools about this innovation. in this paper, apart from dealing with the new-keynesians philips curve, the curve mentioned is estimated for iranian economy. in addition, we are going to com...

While considerable advances have been made in estimating high-dimensional structured models from independent data using Lasso-type models, limited progress has been made for settings when the samples are dependent. We consider estimating structured VAR (vector auto-regressive model), where the structure can be captured by any suitable norm, e.g., Lasso, group Lasso, order weighted Lasso, etc. I...

in this paper, we investigate the performance of parametric arch class models to forecast out-of-sample var for two portfolios of tehran stock exchange (tse) companies (market portfolio and a portfolio of 50 liquid companies), using a number of distributional assumptions and sample sizes at low and high confidence levels. we find, first, that leptokurtic distributions are able to produce better...

Considering profiles as functional variables, two control charts are proposed for their monitoring in phase II. Due to its conformity with the nature of real-world profiles, applying functional model leads to proposed control charts obtained through functional data analysis techniques with desired features. These include simplicity in calculation and possibility of using them for different prof...

The Malthusian model, which implies a long-run interaction between demography and living standards, forms cornerstone of our understanding comparative economic development, as postulated by unified growth theory. Its empirical validity has been supported number studies, most examine England. In Northern Italy, however, there might have reversed “preventive check.” We employ cointegrated VAR mod...

the last few years have seen an explosion in the deployment and use of the internet, networking and telecommunication technologies. this was followed by significant increases in the speed and capacity of computing, for example petaflop supercomputers are becoming common. we will examine some of the developments; explain their importance and potential impact. many forecasts and predictions have ...

We propose a canonical representation of the long run matrix, which can constitute a basis for non-causality testing. This representation requires to determine a sub-matrix rank, which can be done using a test procedure, whose properties are analysed with Monte Carlo experiments.  2000 Elsevier Science S.A. All rights reserved.