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[51] Umargono, E., Suseno, J., & Gunawan, S. K. Hasan Huseyin Yildirim received his Master’s De-
(2020). K-means clustering optimization using gree (2011) in Finance from Marmara University and
the elbow method and early centroid determina- obtained PhD Degree (2016) from Istanbul University.
tion based on mean and median formula. Pro- Mr. YILDIRIM is Assoc. Prof. in the Burhaniye
ceedings of the International Conference on En- Applied Sciences Faculty at Balikesir University. His
gineering, Technology and Industrial Application, research interests include the economy, finance and
19–26. https://doi.org/10.2991/assehr.k.2 banking sector and renewable energy investments.
01010.019 http://orcid.org/0000-0002-5840-8418
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Ahmet Akusta received his PhD from Necmettin Er-
analysis. Journal of Computational and Applied
bakan University. He works at Konya Technical Uni-
Mathematics, 20, 53–65.
versity. His research areas include International Fi-
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nance, Financial Forecasting and Modelling, Invest-
houette clustering with automatic cluster number
ments, and Portfolio Management.
selection. Information Systems, 120, 102290.
http://orcid.org/0000-0002-5160-3210
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tern Analysis and Machine Intelligence, PAMI-1
(2), 224–227.

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