SARIMAX–GARCH Model to Forecast Composite Index with Inflation Rate and Exchange Rate Factors

Indonesia Composite Index SARIMAX-GARCH Inflation Rate Exchange Rate Sustainable Development Goals.

Authors

  • M. Fariz Fadillah Mardianto
    m.fariz.fadillah.m@fst.unair.ac.id
    Faculty of Science and Technology, Airlangga University, Surabaya 60115,, Indonesia
  • Elly Pusporani Faculty of Science and Technology, Airlangga University, Surabaya 60115,, Indonesia
  • Diana Ulya Faculty of Science and Technology, Airlangga University, Surabaya 60115,, Indonesia
  • I Kadek Pasek Kusuma Adi Putra Faculty of Science and Technology, Airlangga University, Surabaya 60115,, Indonesia
  • Rico Ramadhan Faculty of Science and Technology, Airlangga University, Surabaya 60115,, Indonesia

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Investors should consider the Indonesia Composite Index (ICI) as a key indicator before making investment decisions, as it reflects the performance of industries and the broader economic growth. In Indonesia, the ICI exhibits fluctuating movements, making accurate forecasting essential for understanding the country's economic conditions, which are closely tied to capital flows, growth, and tax revenues. This study aims to forecast the ICI using the SARIMAX-GARCH model, incorporating macroeconomic factors such as the inflation rate and exchange rate. The findings reveal that both variables significantly impact the ICI, with the model achieving a Mean Absolute Percentage Error (MAPE) of 0.952% for training data and 5.233% for test data. The model's performance is supported by an R² value of 0.9782 and a Mean Squared Error (MSE) of 0.0003. This research not only improves the accuracy of ICI forecasts but also supports Indonesia's 8th Sustainable Development Goal (SDG) for decent work and economic growth.

 

Doi: 10.28991/HIJ-2024-05-03-014

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