The article examines the monthly dynamics of exports, imports and balance trade between Ukraine Romania in period from 2005 to 2021. Time series 2015 2021 were used for modelling forecasting (since date European Union–Ukraine Association Agreement took effect). Adequate models Box-Jenkins methodology built: additive with seasonal component ARIMA (Autoregressive Integrated Moving Average) ARIMAS...

For many years, various methods for the identification and estimation of parameters in linear, discrete-time transfer functions have been available and implemented in widely available Toolboxes for Matlab. This paper considers a unified Refined Instrumental Variable (RIV) approach to the estimation of discrete and continuous-time transfer functions characterized by a unified operator that can b...

Gordon and Shapiro (1956 Management Sci. 10 102–10) first equated the price of a share with the present value of future dividends and derived the well known relationship. Since then, there have been many improvements on the theory. For example, Thompson (1985 Managerial Decis. Economics 6 132–40, 1987 Managerial Decis. Economics 8 321–32) combined the ‘dividend yield plus growth’ method with Bo...

Introduction The foundation for fundamental analysis is supply and demand for the commodity in question. Fundamental analysis involves modelling the supply-demand relationships in a market. Analysis of investments, including commodity futures, can be labelled as fundamental or technical. Supply and demand are far more difficult to analyse and model than generally realized. To provide useful res...

The merits of the modelling philosophy of Box & Jenkins (1970) are illustrated with a summary of our recent work on seasonal river flow forecasting. Specifically, this work demonstrates that the principle of parsi-mony, which has been questioned by several authors recently, is helpful in selecting the best model for forecasting seasonal river flow. Our work also demonstrates the importance of m...

conclusions there was a decreasing trend in the study and the future years. it seems that implementation of some interventions in the recent decade has had a positive effect on the decline of rta fatalities. nevertheless, there is still a need to pay more attention in order to prevent the occurrence and the mortalities related to traffic accidents. results the mean age of the victims was 37.22 ...

hydrologists have always tried to classify atmospheric and hydrologic events in order to simplify the hydrologic convolutions and the observations or to save the time and the budget. most of these methods are used for the regionalization of hydrologic phenomena like rainfall,streamflow and other components of water cycle.multivariate techniques have been underlined as suitableand powerful tools...

In this study, we introduce and investigate a class of neural architectures of Polynomial Neural Networks (PNNs), discuss a comprehensive design methodology and carry out a series of numeric experiments. PNN is a flexible neural architecture whose structure (topology) is developed through learning. In particular, the number of layers of the PNN is not fixed in advance but becomes generated on t...

background: predicting the incidence of tuberculosis (tb) plays an important role in planning health control strategies for the future, developing intervention programs and allocating resources. objectives: the present longitudinal study estimated the incidence of tuberculosis in 2014 using box-jenkins methods. materials and methods: monthly data of tuberculosis cases recorded in the surveillan...