COGNITIVE BIAS EFFECTS ON POLYTECHNIC STUDENTS’ INVESTMENT DECISIONS IN SEMARANG

Dwi Andriani; Dina Yeni Martia; Dzulqarnaen Arief Mustofa; Mutiara Febrianti; Rini Setiyani; Xarista Christy

doi:10.37641/riset.v8i1.2705

Authors

Dwi Andriani Politeknik Negeri Semarang
Dina Yeni Martia Politeknik Negeri Semarang
Dzulqarnaen Arief Mustofa Politeknik Negeri Semarang
Mutiara Febrianti Politeknik Negeri Semarang
Rini Setiyani Politeknik Negeri Semarang
Xarista Christy Politeknik Negeri Semarang

DOI:

https://doi.org/10.37641/riset.v8i1.2705

Keywords:

Self-Attribution Bias, Overconfidence Bias, Confirmation Bias, Investment Decision-Making, Cognitive Psychology

Abstract

The rapid growth of young investors in Financial reflects increasing engagement with the capital market, yet novice investors remain vulnerable to cognitive biases in decision-making. This study investigates the influence of self-attribution bias (internal and external), confirmation bias, and overconfidence bias on investment decision-making among undergraduate Polytechnic students in Semarang. A quantitative research design was employed using a structured questionnaire, and the data collected from 117 respondents were analyzed using Partial Least Squares Structural Equation Modeling (PLS-SEM). Findings reveal that internal self-attribution bias significantly affects investment decisions, both directly and through its mediating role in overconfidence bias. In contrast, confirmation bias showed a financially significant effect on investment behavior. The study concludes that internal psychological attributions, particularly beliefs in personal competence, are key drivers of student investor behavior. These results underscore the importance of integrating behavioral finance and awareness of cognitive biases into financial education to support more rational, informed investment decisions.

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References

Acharya, Y., & Rajdev, A. A. (2025). Impact of Cognitive Biases and Emotional Intelligence on Investment Decisions – A Mediating Role of Emotional Intelligence on Confirmation Bias The investor behavior : from the perspective of emotion and rationality. 43(06), 22–34.

Anggini, N. D., Wardoyo, C., & Wafaretta, V. (2020a). Pengaruh Self-Attribution Bias, Mental Accounting, dan Familiarity Bias terhadap Pengambilan Keputusan Investasi Mahasiswa Akuntansi. Jurnal Riset Bisnis Dan Investasi.

Anggini, N. D., Wardoyo, C., & Wafaretta, V. (2020b). Pengaruh Self-Attribution Bias, Mental Accounting, dan Familiarity Biasterhadap Pengambilan Keputusan InvestasiMahasiswa Akuntansi.

Angraini, L. A. (2022). Jurnal Bisnis dan Manajemen Sentimen Investor , Faktor Fundamental Makroekonomi dan Excess Return Pasar Saham di Indonesia. 9(1), 27–34.

Asri, V., & Santi, F. (2025). ANALISIS FREKUENSI TRADING SAHAM GENERASI Z INDONESIA : EFEK FAKTOR BIAS PERILAKU. 14(03), 1061–1075.

Barber, B. M., Huang, X., Ko, K., & Odean, T. (2019). Leveraging Overconfidence. SSRN Electronic Journal. https://doi.org/10.2139/ssrn.3445660

Binnendyk, J. (2024). Individual differences in overconfidence : A new. 19, 1–24. https://doi.org/10.1017/jdm.2024.22

Budhi, S. (2018). Analisis statistik multivariate dengan aplikasi SEM PLS SMARTPLS 3.2.6.

Cheng, C. X. (2019). Confirmation Bias in Investments. 11(2), 50–55. https://doi.org/10.5539/ijef.v11n2p50

Ekajaya, B., & Arifin, A. Z. (2024). Pengaruh representativeness dan overconfidence terhadap keputusan investasi investor pada investor saham di Jabodetabek. Jurnal Manajemen Bisnis Dan Kewirausahaan, 8(3), 582–591. https://doi.org/10.24912/jmbk.v8i3.30219

Gulo, C. G., & Cahyonowati, N. (2024). PENGARUH OVERCONFIDENCE BIAS, HERDING BIAS, SELF- ATTRIBUTION BIAS, DAN CONFIRMATION BIAS TERHADAP PENGAMBILAN KEPUTUSAN INVESTASI INVESTOR PEMULA (Studi Kasus pada KSPM Diponegoro). 13, 1–14.

Gunawan, K., & Wiyanto, H. (2022). FINANCIAL LITERACY , RISK TOLERANCE , LOSS AVERSION BIAS TERHADAP KEPUTUSAN INVESTASI. 04(03), 573–580.

Hair, J. F., Hult, G. T. M., Ringle, C. M., Sarstedt, M., Danks, N. P., & Ray, S. (2021). Partial Least Squares Structural Equation modeling (PLS-SEM) Using R. https://doi.org/10.1007/978-3-030-80519-7_5

Hastuti, P., Nurofik, A., Purnomo, A., Hasibuan, A., Ariwibowo, H., Faried, A. I., Tasnim, Sudarso, A., & Simarmata, J. (2020). Kewirausahaan UMKM. Yayasan Kita Menulis.

Hesniati, & Dedy. (2021). Faktor-Faktor Yang Mempengaruhi Keputusan Investasi Properti Pada Kota Batam. E-Bisnis : Jurnal Ilmiah Ekonomi Dan Bisnis, 14(2), 89–98. https://doi.org/10.51903/e-bisnis.v14i2.506

Holly, A., Mardiana, A., Jao, R., & Patandianan, T. L. (2025). Pengaruh Self Attribution Bias , Mental Accounting , Familiarity Bias dan Toleransi Risiko terhadap Pengambilan Keputusan Investasi. Jurnal Inovasi Akuntansi (JIA), 3(2988–1536), 1–20.

Husadha, C., Hidayat, W. W., Fitriani, D., & Rossa, E. (2022). Studi kasus: Mental accounting bias dan confirmation bias terhadap pengambilan keputusan investasi saham pada galeri investasi universitas. Jurnal Riset Akuntansi Dan Keuangan, 4(2), 137–148.

Ikhfani, F. K., Firmansyah, H., & Fuadi, F. (2025). Pengaruh overconfidence bias dan herding bias terhadap pengambilan keputusan mahasiswa dalam berinvestasi pada pasar modal. Jurnal Akuntansi Aisyah, 6(1), 1–10.

Islam, K. U., Bhat, S. A., Lone, U. M., Darzi, M. A., & Malik, I. A. (2024). Financial risk propensity and investment decisions: An empirical analysis using behavioural biases. IIMB Management Review, 36(3), 213–229. https://doi.org/10.1016/j.iimb.2024.06.004

Iva, I. K. S., Selvia, S. D. O., Asih, W. A. F., & Patni, P. U. D. (2024). the Influence of Anchoring, Effect Framing, and Overconfidence of Investment Decision Making for the Milennial Generation. Jurnal Akuntansi, Keuangan, Perpajakan Dan Tata Kelola Perusahaan, 2(1), 210–226. https://doi.org/10.70248/jakpt.v2i1.954

Jain, Jinesh, Walia, Nidhi, Kaur, Manpreet, Sood, Kirti, & Kaur, Dilraj. (2023). Shaping Investment Decisions Through Financial Literacy: Do Herding and Overconfidence Bias Mediate the Relationship? Global Business Review, 09721509221147409. https://doi.org/10.1177/09721509221147409

Karki, U., Bhatia, V., & Sharma, D. (2024). A Systematic Literature Review on Overcon dence and Related Biases In uencing Investment Decision Making. 26(2), 130–150.

Khusna, A. A. (2021). PENGARUH CONFIRMATION BIAS, SELF-ATTRIBUTION BIAS, OVERCONFIDENCE BIAS, COGNITIVE DISSONANCE BIAS, DAN HERDING BIAS TERHADAP PENGAMBILAN KEPUTUSAN INVESTOR PEMULA DALAM INVESTASI SAHAM DI MASA PANDEMI COVID-19.

Kulintang, A., & Putri, E. (2024). Peran Literasi Keuangan , Risk Tolerance , Overconfidence Serta Financial Technology dalam Mendorong Keputusan Investasi. 11(1), 39–55.

Kusumawardani, A., & Yuliyanti, E. (2023). Pengaruh Self-Attribution Bias terhadap Perilaku Investor dengan Overconfidence Bias sebagai Variabel Intervening. Jurnal Ilmiah Ekonomi Dan Manajemen, 1(4), 576–586. https://doi.org/10.61722/jiem.v1i4.509

Lionardo, H. C., Resubun, L. A., & Sahetapy, K. A. (2025). Role of Familiarity Bias and Confirmation Bias in Investment Decisions: The Moderating Role of Financial Literacy - A Case Study of FEB Students at Universtas Klabat. Jurnal Economic Resource, 8(1), 338–349. https://doi.org/10.57178/jer.v8i1.1385

Malini, H. (2025). And Investment Decisions Among University Students In Indonesia ’ s Major Cities. 10(1), 93–117. https://doi.org/10.20473/baki.v10i1.66329

Mishra, S. B. (2018). Behavioural Finance: Investors Self Attribution and Overconfidence. International Journal of Management Sciences and Business Research, 7(December 2018), 12. https://doi.org/10.13140/RG.2.2.15451.21287

Mohanty, S., Patnaik, B. C. M., Satpathy, I., & Sahoo, S. K. (2024). Cognitive biases and financial decisions of potential investors during Covid-19: an exploration. Arab Gulf Journal of Scientific Research, 42(3), 836–851. https://doi.org/10.1108/AGJSR-12-2022-0296

Murhadi, W. (2018). BIAS ASPECT IN DECISION MAKING FOR BUYING LIFE INSURANCE IN BIAS ASPECT IN DECISION MAKING FOR BUYING LIFE INSURANCE IN INDONESIA. November.

Naveed, F., & Taib, H. M. (2023). Overconfidence Bias , Self-attribution Bias and Investor Decisions : Moderating Role of Information Acquisition Overconfidence Bias , Self-attribution Bias and Investor Decisions : Moderating Role of Information Acquisition. November.

Pandji, V. C., Suhartono, E., Tristiarini, N., & Oktafiyani, M. (2024). Pengaruh, Mental Accounting, Familiarity Bias, Self Atribution Bias Terhadap Pengambilan Keputusan Investasi (Studi Kasus, Mahasiswa Feb Udinus Semarang). JEMSI (Jurnal Ekonomi Manajemen, Dan Akutansi, 10, 688–703.

Paramita, R. A. S. (2018). http://journal.unj.ac.id/unj/index.php/jrmsi 214. 9(2), 214–235.

Pradhana, R. W. (2018). Financial literacy , cognitive bias ,. 6, 108–117.

Pradikasari, E., & Isbanah, Y. (2018). Pengaruh financial literacy, illusion of control, overconfidence, risk tolerance, dan risk perception terhadap keputusan investasi pada mahasiswa di kota surabaya. 6, 424–434.

Pradnyani, L. G. R. R., & Sujana, I. K. (2023). Financial Literacy , Financial Behavior , Overconfidence and Investment Decisions PENDAHULUAN Dengan berkembangnya kemajuan teknologi mengenai keuangan , akan meningkatkan wawasan individu dalam mengelola keuangannya tersebut . Dewasa ini terdapat banyak. 1391–1405.

Rose, J. B. D., & Armansyah, R. F. (2022). Recency Bias Dan Confirmation Bias Pada Keputusan Investasi Investor Pasar Modal Indonesia. Jurnal Ilmiah Manajemen Dan Bisnis (JIMBis), 1(2), 136–152. https://doi.org/10.24034/jimbis.v1i2.5366

Said, R. (2020). Analisis Perilaku Investor Terhadap Pengambilan Keputusan di Pasar Saham (Investor Makassar).

Salis, M. I., Situngkir, T. L., Apriyanti, A., & Khotimah, N. F. (2024). Overconfidence and Investment Decisions: A Descriptive Study of the Literature from a Behavioral Finance Perspective. International Journal of Economics Development Research, 5(6), 4919–4927.

Saraskanrood, Z. K., & Ghafouri, Z. (2022). The Effect of Self-attribution Bias on Investor’s behavior: Mediating Role of Overconfidence Bias in the Capital Market of Iran. Journal of International Marketing Modeling, 3(2), 110–122.

Setiawan, Y. C., Atahau, A. D. R., & Robiyanto, R. (2018). Cognitive Dissonance Bias, Overconfidence Bias dan Herding Bias dalam Pengambilan Keputusan Investasi Saham. AFRE (Accounting and Financial Review), 1(1), 17–25. https://doi.org/10.26905/afr.v1i1.1745

Shah, K. (2025). Inside the minds of Gen Z and Millennial investors in the US. YouGov. https://doi.org/https://business.yougov.com/content/52455-inside-the-minds-of-gen-z-and-millennial-investors-in-the-us

Shunmugasundaram, V., & Sinha, A. (2025). The impact of behavioral biases on investment decisions: a serial mediation analysis. Journal of Economics, Finance and Administrative Science, 30(59), 5–21. https://doi.org/10.1108/JEFAS-08-2023-0243

Supramono, S., & Wandita, M. (2017). Confirmation Bias, Self-Attribution Bias, Dan Overconfidence Dalam Transaksi Saham. Jurnal Keuangan Dan Perbankan, 21(1). https://doi.org/10.26905/jkdp.v21i1.1224

Syahaya, J. T., Pardosi, A. P. C., Arni, A., Nababan, N. S., & Ningsih, R. R. (2024). Peran Financial Literacy dan Overconfidence dalam Pengambilan Keputusan Investasi: Suatu Tinjauan Kuantitatif. Journal of Innovation in Management, Accounting and Business, 3(1), 36–45. https://doi.org/10.56916/jimab.v3i1.565

Syahfitri, D. I., & Tryana, A. L. (2024). Pengaruh Overconfidence , Toleransi Risiko , dan Perilaku Keuangan Terhadap Keputusan Berinvestasi di Bursa Efek Indonesia. 10, 911–922.

Tomlinson, A. (2019). European millennials and investing: a global comparison______. Calasatone. https://doi.org/https://www.calastone.com/insights/european-millennials-and-investing-a-global-comparison/

ul Abdin, S. Z., Qureshi, F., Iqbal, J., & Sultana, S. (2022). Overconfidence bias and investment performance: A mediating effect of risk propensity. Borsa Istanbul Review, 22(4), 780–793. https://doi.org/10.1016/j.bir.2022.03.001

Walters, D. J., & Fernbach, P. M. (2021). Investor memory of past performance is positively biased and predicts overconfidence. Proceedings of the National Academy of Sciences of the United States of America, 118(36), 1–8. https://doi.org/10.1073/pnas.2026680118

Wandita, M., Diponegoro, J., & Salatiga, N. (2017). Confirmation bias, self-attribution bias , dan overconfidence dalam transaksi saham. 21(040), 25–36.

Wandita, M., Memenuhi, G., Dari, S., Untuk, P.-P., Gelar, M., Ekonomi, S., Ekonomika, F. :, & Bisnis, D. (2016). CONFIRMATION BIAS, SELF-ATTRIBUTION BIAS DAN OVERCONFIDENCE DALAM TRANSAKSI SAHAM Oleh : Diajukan kepada Fakultas Ekonomika dan Bisnis. UNIVERSITAS KRISTEN SATYA WACANA.

Wirawan, R., Mildawati, T., & Suryono, B. (2022). Determinan Pengambilan Keputusan Investasi Berdasarkan Norma Subjektif, Kontrol Perilaku, Dan Perilaku Heuristik. EKUITAS (Jurnal Ekonomi Dan Keuangan), 6(1), 43–57. https://doi.org/10.24034/j25485024.y2022.v6.i1.5163

Xinhua. (2025). Young investors make up majority in Indonesia’s stock market. News Asia&Pacific. https://doi.org/https://english.news.cn/asiapacific/20250811/d97172f2b80d4d53b71efdfd6402d45a/c.html

Zahro, D. El, & Singgih, M. N. (2024). Pengaruh Herding Bias, Overconfidence Bias, dan Cognitive Dissonance Bias terhadap Keputusan Investasi. Business Management Research, 3(2), 72–83. https://doi.org/10.26905/bismar.v3i2.13772