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All Journal Jurnal Multidisiplin Indonesia Journal of Management Economics and Financial Accounting
Yenny Ernitawati
Universitas Dian Nuswantoro
Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Economics, Econometrics & Finance Law, Crime, Criminology & Criminal Justice

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Comparison of Markowitz and Genetic Algorithm Models for Saudi Arabian Stocks Mega Tri Candeni; Dwi Eko Waluyo; Ana Kadarningsih; Yenny Ernitawati
Journal of Management Economics and Financial Accounting Vol. 2 No. 1 (2026): June: Journal of Management Economics and Financial Accounting (JOMEFA)
Publisher : Denasya Smart Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69714/z0rwmk14

Abstract

This study aims to compare the Markowitz method and the Genetic Algorithm in forming an optimal portfolio in the Saudi Arabian stock market, which is known to have dynamic characteristics and high levels of volatility due to the influence of economic reforms, oil price fluctuations, and integration with global markets. The study uses daily closing price data for companies indexed in the Tadawul All Share Index for the period January 2, 2022, to October 30, 2025, obtained through Yahoo Finance. Sample selection uses a purposive sampling method based on data completeness and Coefficient of Variation selection. The optimization process is carried out using the Python programming language through the Efficient Frontier Markowitz approach and the Genetic Algorithm. While portfolio performance evaluation is carried out using the Sharpe Ratio, Sortino Ratio, and Omega Ratio to obtain a more comprehensive assessment of risk and return efficiency. The results show that the Markowitz method tends to produce higher expected returns, but with a greater level of risk, while the Genetic Algorithm produces a portfolio with a relatively lower level of risk and more stability. Furthermore, conventional stock portfolios performed better than Islamic stock portfolios based on the performance ratio evalu-ation used. This finding suggests that portfolio optimization methods should be tailored to investor risk preferences and the characteristics of the investment market.
Peran Financial Self-Efficacy dalam Memediasi Pengaruh Social Comparison Orientation dan Financial Literacy terhadap Financial Management Behavior Generasi Z di Jepara Devi Atalia Zahra; Vicky Oktavia; Diana Puspitasari; Yenny Ernitawati
Jurnal Multidisiplin Indonesia Vol. 4 No. 2 (2026): Juni: Jurnal Multidisiplin Indonesia
Publisher : PT. ALHAFI BERKAH INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62007/joumi.v4i2.853

Abstract

This research explores financial self-efficacy as a mediator in the influence of social comparison orientation and financial literacy on the financial management behavior of Generation Z in Jepara. Data from 140 purposively selected respondents were analyzed using the PLS-SEM approach (SmartPLS 4.0) to examine the direct and indirect effects between variables via path analysis. The results showed that Financial Literacy has a positive and significant effect on both Financial Self-Efficacy and Financial Management Behavior. In addition, Financial Self-Efficacy also has a positive and significant effect on Financial Management Behavior. Social Comparison Orientation was proven to have a positive and significant effect on Financial Management Behavior, but it does not have a significant effect on Financial Self-Efficacy. Financial Self-Efficacy was proven It can mediate the influence of Financial Literacy on Financial Management Behavior, but it cannot mediate the influence of Social Comparison Orientation on Financial Management Behavior. So, it's proven that Financial Literacy and Financial Self-Efficacy play an important role in improving Financial Management Behavior among Generation Z in Jepara behavior among Generation Z in Jepara is influenced by financial knowledge and Financial Self-Efficacy.
Co-Authors Ana Kadarningsih Kadarningsih Devi Atalia Zahra Diana Puspitasari Dwi Eko Waluyo Mega Tri Candeni Vicky Oktavia