Research Article


DOI :10.26650/ekoist.2022.37.1183809   IUP :10.26650/ekoist.2022.37.1183809    Full Text (PDF)

Improving Forecast Accuracy Using Combined Forecasts with Regard to Structural Breaks and ARCH Innovations

Daud Ali AserEsin Firuzan

Accurate forecasts about the future are vital in time series analyses, but accurately modeling complex structures in the data is always challenging. Two major sources of complexity are autoregressive conditional heteroskedasticity (ARCH) effects on data as well as structural breaks in the data, as these affect the quality of data and hence reduce forecast accuracy. In this regard, combining forecast types has been a helpful strategy for improving forecast accuracy for more than 50 years since Bates and Granger’s (1969) original paper. Hence, this paper aims to examine if the gains from combined forecasts are sustained regarding cases with structural breaks and ARCH innovations. Moreover, the study explores which forecast combination schemes are optimal for those cases by combining the exponentialsmoothing (ETS), autoregressive integrated moving average (ARIMA), and artificial neural network (ANN) forecast models using simple and regression-based combination procedures. These methods are implemented in both simulated series and over empirical data from two popular Turkish stock exchanges (i.e., BIST-30 and BIST-100 Indexes). The study has found regressionbased forecast combination methods to significantly improve forecast accuracy regarding cases with structural breaks and conditional heteroscedasticity. Dynamically weighted combinations show greater accuracy improvement compared to their static counterparts when the data contain a trend. Simple combination schemes, including simple averages, just perform better than single methods for ETS and ARIMA, while they barely outperform ANN. In conclusion, ANN is found to be the best-performing individual forecasting method for all cases and designs.


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APA

Aser, D.A., & Firuzan, E. (2022). Improving Forecast Accuracy Using Combined Forecasts with Regard to Structural Breaks and ARCH Innovations. EKOIST Journal of Econometrics and Statistics, 0(37), 1-25. https://doi.org/10.26650/ekoist.2022.37.1183809


AMA

Aser D A, Firuzan E. Improving Forecast Accuracy Using Combined Forecasts with Regard to Structural Breaks and ARCH Innovations. EKOIST Journal of Econometrics and Statistics. 2022;0(37):1-25. https://doi.org/10.26650/ekoist.2022.37.1183809


ABNT

Aser, D.A.; Firuzan, E. Improving Forecast Accuracy Using Combined Forecasts with Regard to Structural Breaks and ARCH Innovations. EKOIST Journal of Econometrics and Statistics, [Publisher Location], v. 0, n. 37, p. 1-25, 2022.


Chicago: Author-Date Style

Aser, Daud Ali, and Esin Firuzan. 2022. “Improving Forecast Accuracy Using Combined Forecasts with Regard to Structural Breaks and ARCH Innovations.” EKOIST Journal of Econometrics and Statistics 0, no. 37: 1-25. https://doi.org/10.26650/ekoist.2022.37.1183809


Chicago: Humanities Style

Aser, Daud Ali, and Esin Firuzan. Improving Forecast Accuracy Using Combined Forecasts with Regard to Structural Breaks and ARCH Innovations.” EKOIST Journal of Econometrics and Statistics 0, no. 37 (Jul. 2024): 1-25. https://doi.org/10.26650/ekoist.2022.37.1183809


Harvard: Australian Style

Aser, DA & Firuzan, E 2022, 'Improving Forecast Accuracy Using Combined Forecasts with Regard to Structural Breaks and ARCH Innovations', EKOIST Journal of Econometrics and Statistics, vol. 0, no. 37, pp. 1-25, viewed 14 Jul. 2024, https://doi.org/10.26650/ekoist.2022.37.1183809


Harvard: Author-Date Style

Aser, D.A. and Firuzan, E. (2022) ‘Improving Forecast Accuracy Using Combined Forecasts with Regard to Structural Breaks and ARCH Innovations’, EKOIST Journal of Econometrics and Statistics, 0(37), pp. 1-25. https://doi.org/10.26650/ekoist.2022.37.1183809 (14 Jul. 2024).


MLA

Aser, Daud Ali, and Esin Firuzan. Improving Forecast Accuracy Using Combined Forecasts with Regard to Structural Breaks and ARCH Innovations.” EKOIST Journal of Econometrics and Statistics, vol. 0, no. 37, 2022, pp. 1-25. [Database Container], https://doi.org/10.26650/ekoist.2022.37.1183809


Vancouver

Aser DA, Firuzan E. Improving Forecast Accuracy Using Combined Forecasts with Regard to Structural Breaks and ARCH Innovations. EKOIST Journal of Econometrics and Statistics [Internet]. 14 Jul. 2024 [cited 14 Jul. 2024];0(37):1-25. Available from: https://doi.org/10.26650/ekoist.2022.37.1183809 doi: 10.26650/ekoist.2022.37.1183809


ISNAD

Aser, DaudAli - Firuzan, Esin. Improving Forecast Accuracy Using Combined Forecasts with Regard to Structural Breaks and ARCH Innovations”. EKOIST Journal of Econometrics and Statistics 0/37 (Jul. 2024): 1-25. https://doi.org/10.26650/ekoist.2022.37.1183809



TIMELINE


Submitted03.10.2022
Accepted22.11.2022
Published Online29.12.2022

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