Sign and amplitude representation of the forex networks

We decompose the exchange rates returns of 41 currencies (incl. gold) into their sign and amplitude components. Then we group together all exchange rates with a common base currency, construct Minimal Spanning Trees for each group independently, and analyze properties of these trees. We show that both the sign and the amplitude time series have similar correlation properties as far as the core network structure is concerned. There exist however interesting peripheral differences that may open a new perspective to view the Forex dynamics.Comment: Article based on talk by S. Gworek given at FENS'08 Conference, Rzeszow, Polan

Wykorzystanie predyktorów typu neural network do prognozowania szeregów czasowych

Tyt. z nagłówka.Bibliografia s. 61-62.Dostępny również w formie drukowanej.STRESZCZENIE: W pracy przedstawiono rozważania dotyczące zastosowania sztucznych sieci neuronowych do prognozowania zjawisk gospodarczych opisanych za pomocą krótkich szeregów czasowych. W pierwszej części artykułu przedstawiono krótką charakterystykę sztucznych sieci neuronowych wraz z możliwymi obszarami prognozowania ekonomicznego, w których mogą znaleźć zastosowanie. W drugiej części artykułu przeprowadzono ocenę efektywności predykcji wybranego zjawiska za pomocą sztucznych sieci neuronowych. SŁOWA KLUCZOWE: prognozowanie ekonomiczne, predyktory, szeregi czasowe, sztuczne sieci neuronowe, analiza efektywności. ABSTRACT: This article presents consideration for forecasting activity of economic phenomenon described behind assistance of short time range concerning employment artificial neural network. It presents short characteristic of artificial neural network in first along with possible areas of economic forecasting activities, can find application. The second part of the paper includes an estimation of efficiency of selected economic phenomenon with an application of artificial neural networks. KEYWORDS: business forecasting, predictors, forecasting activity of time range, artificial neural networks, estimation of efficiency

Sign and amplitude representation of the forex networks

We decompose the exchange rates returns of 41 currencies (incl. gold) into their sign and amplitude components. Then we group together all exchange rates with a common base currency, construct Minimal Spanning Trees for each group independently, and analyze properties of these trees. We show that both the sign and the amplitude time series have similar correlation properties as far as the core network structure is concerned. There exist however interesting peripheral differences that may open a new perspective to view the Forex dynamics.

Structure and evolution of the foreign exchange networks

We investigate topology and temporal evolution of the foreign currency exchange market viewed from a weighted network perspective. Based on exchange rates for a set of 46 currencies (including precious metals), we construct different representations of the FX network depending on a choice of the base currency. Our results show that the network structure is not stable in time, but there are main clusters of currencies, which persist for a long period of time despite the fact that their size and content are variable. We find a long-term trend in the network's evolution which affects the USD and EUR nodes. In all the network representations, the USD node gradually loses its centrality, while, on contrary, the EUR node has become slightly more central than it used to be in its early years. Despite this directional trend, the overall evolution of the network is noisy.

Analysis of a network structure of the foreign currency exchange market

Foreign exchange market, Correlation matrix, Networks, Minimal spanning tree,