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All Journal Euler : Jurnal Ilmiah Matematika, Sains dan Teknologi Jurnal Matematika Integratif
Fitri, Sa'adatul
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Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Engineering Mathematics Mechanical Engineering Transportation

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Discrete Dynamical System generated by set-valued function in metric spaces Muslikh, Mohamad; Fitri, Sa'adatul
Jurnal Matematika Integratif Vol 20, No 2: Oktober 2024
Publisher : Department of Matematics, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/jmi.v20.n2.57524.209-216

Abstract

The main purpose of this article is to study the behavior of the solutionsof discrete dynamical systems generated by set-valued mapping. Moreprecisely, we study the existence of convergence iterations in the presence of computational errors for set-valued mapping. Then a necessarycondition shows the existence and uniqueness of a fixed point for theset-valued maps.
Perbandingan Akurasi Metode Autoregressive Integrated Moving Average dan Geometric Brownian Motion untuk Peramalan Harga Saham Indonesia Hamdani, Aldan Maulana; Widhiatmoko, Fery; Fitri, Sa'adatul
Euler : Jurnal Ilmiah Matematika, Sains dan Teknologi Volume 13 Issue 1 April 2025
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/euler.v13i1.30760

Abstract

Investment is an activity of managing sources of funds with the goal of increasing profits within a certain period of time. The number of investors in the capital market, especially stock investments continue to increase. Stock movements result in returns that investors can obtain. Randomly fluctuating share prices make it difficult for investors to forecast share prices. This research helps investors in forecasting stock price movements based on PT. Gudang Garam Tbk. (GGRM) for the period 2022. This research aims to determine the level accuracy of the Geometric Brownian Motion (GBM) and Autoregressive Integrated Moving Average (ARIMA) methods in forecasting stock price movements. The accuracy level of the Mean Absolute Percentage Error (MAPE) for the GBM method is 1.68% and the ARIMA method forecasting results is 3.37%. The MAPE value of both methods is less than 10\%, so it can be said that both methods are best fitting and have a high level of accuracy in forecasting stock price movements. The GBM method is better at forecasting stock prices because it is more realistic for financial asset price models because it includes volatility in the model.
Co-Authors Fery Widhiatmoko Hamdani, Aldan Maulana Mohamad Muslikh