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  4. Information technology for time series forecasting by the method of the forecast scheme synthesis

Information technology for time series forecasting by the method of the forecast scheme synthesis

UJIT.
2021;
Volume 3, Number 2
: 81-86
https://doi.org/10.23939/ujit2021.02.081
Received: September 29, 2021
Accepted: November 23, 2021

Цитування за ДСТУ: Мулеса О. Ю., Гече Ф. Е., Батюк А. Є., Мельник О. О. Інформаційна технологія прогнозування часових рядів методом синтезу прогнозної схеми. Український журнал інформаційних технологій. 2021, т. 3, № 2. С. 81–86.

Citation APA: Mulesa, O. Yu., Geche, F. E., Batyuk, A. Ye., & Melnyk, O. O. (2021). Information technology for time series forecasting by the method of the forecast scheme synthesis. Ukrainian Journal of Information Technology, 3(2), 81–86. https://doi.org/10.23939/ujit2021.02.081

Authors:
  1. O. Yu. Mulesa
  2. F. E. Geche
  3. A. Ye. Batiuk
  4. O. O. Melnyk
1
Uzhhorod National University, Uzhhorod, Ukraine
2
Uzhhorod National University, Uzhhorod, Ukraine
3
Lviv Polytechnic National University, Lviv, Ukraine
4
Uzhhorod National University, Uzhhorod, Ukraine

The study is devoted to the development of information technology for forecasting based on time series. It has been found that it is important to develop new models and forecasting methods to improve the quality of the forecast. Information technology is based on the evolutionary method of synthesis of the forecast scheme grounded on basic forecast models. The selected method allows you to consider any number of predictive models that may belong to different classes. For a given time series, the weight coefficients with which the models are included in the resulting forecast scheme are calculated by finding the solution to the optimization problem. The method of constructing the objective function for the optimization problem in the form of a linear combination of forecasting results by basic forecasting models is shown. It is proposed to find the solution to the optimization problem using a genetic algorithm. The result of the method is the forecast scheme, which is a linear combination of basic forecast models. To assess the quality of the forecast, it is suggested to use forecasting errors or forecast volatility calculated as the standard deviation. Forecast quality criteria are selected depending on the context of the task. The use of forecast volatility as a quality criterion, with repeated use of technology, will reduce the deviation of forecast values from real data. The structural scheme of information technology is developed. Structurally, information technology consists of two blocks: data processing and interpretation of the obtained values. The result of the application of the developed information technology is the production rules for determining the predicted value of the studied quantity. Experimental verification of the obtained results was performed. The problem of forecasting the number of religious organizations in Ukraine based on statistical data from 1997 to 2000 has been solved. The autoregression method and the linear regression model were chosen as the basic forecast models. Based on the results of using the developed information technology, the weights of the basic models were calculated. It is demonstrated that the obtained forecast scheme allowed to improve the average absolute percentage error and forecast volatility in comparison with the selected models.

information technology
time series
forecasting
evolutionary technologies
forecast volatility
synthesis of the forecast scheme
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