We propose an Autoregressive Conditional Marked Duration (ACMD) model for the analysis of irregularly spaced transaction data. Based on the Autoregressive Conditional Duration (ACD) model, the ACMD model assigns marks to characterize events such as tick movements and trade directions (buy/sell). Applying the ACMD model to tick movements, we study the influence of trade frequency, direction and ...

Arthropod-borne viruses (arboviruses) are maintained in a cycle of alternating transmission between vertebrate hosts and arthropod vectors. Arboviruses possess RNA genomes capable of rapid diversification and adaptation, and the between-host trade-offs inherent to host alternation impose well-documented constraints on arbovirus evolution. Here, we investigate the less well-studied within-host t...

many studies indicate that trade costs are large and significant. the question is whether trade costs could explain the size of the trade and shed light on the mystery of missing trade. in this framework, this paper studies 73 developing countries in the period 2005-2011. the results of our panel data analysis signify that “the pecuniary costs of trade” and “the number of necessary documents” a...

Trade among Arab countries has been very weak despite previous efforts to engage into different forms of regional economic integration. Using the flexible framework provided by the Gravity Model, the paper gives an order of magnitude of the main factors often presented in explaining the weakness of inter-Arab Trade. The results of the model together with several indicators about export profiles...

This paper uses a static and dynamic gravity model of trade to investigate the link between German development aid and exports from Germany to the recipient countries. The findings indicate that in the long run German aid is associated with an increase in exports of goods that is larger than the aid flow, with a point estimate of 140 percent of the aid given. In addition, the evolution of the e...

Among non-oil exports and in trade arena, drug has always been strategic importance and most government especially industrialized countries pay special attention to its production and trade issues. Thus, having a comprehensive view from economic perspective to this section is essential for suggesting intervention. This was a descriptive-analytical and panel study. In this study, gravity model i...

In this letter we work out the secular precession of the spin of a gyroscope in geodesic motion around a central mass in the framework of the Dvali-Gabadadze-Porrati multidimensional gravity model. Such an effect, which depends on the mass of the central body and on the orbit radius of the gyroscope, contrary to the precessions of the orbital elements of the orbit of a test body, is far too sma...

International trade allows for wider access to goods and services in domestic markets. It contributes socio-economic development, it is an important factor raising living standards. The aim of the study provide a duration analysis relationships Polish enterprises on intra-community market determine influence selected factors length time last. We employ survival methods (the case 87 CN chapter—v...

The recent literature on the duration of trade has predominantly analyzed the determinants of trade flow durations using Cox proportional hazards models. The purpose of this paper is to show why it is inappropriate to analyze the duration of trade with continuous-time models such as the Cox model, and to propose alternative discrete-time models which are more suitable for estimation. Briefly, t...