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Start date: 2010End date: 2019Type: search.filters.itemtype.Conference PaperHas files: NoAuthor: search.filters.author.Kocak, TaskinAuthor: search.filters.author.Güngör, Vehbi ÇağrıSubject: search.filters.subject.Classification (of Information)

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    Evaluation of hybrid classification approaches: Case studies on credit datasets
    (Springer Verlag [email protected], 2018) Cetiner, Erkan; Güngör, Vehbi Çağrı; Kocak, Taskin; Perner, P.; Cetiner, Erkan, Bahçeşehir Üniversitesi, Istanbul, Turkey; Güngör, Vehbi Çağrı, Abdullah Gül Üniversitesi, Kayseri, Turkey; Kocak, Taskin, Bahçeşehir Üniversitesi, Istanbul, Turkey
    Hybrid classification approaches on credit domain are widely used to obtain valuable information about customer behaviours. Single classification algorithms such as neural networks, support vector machines and regression analysis have been used since years on related area. In this paper, we propose hybrid classification approaches, which try to combine several classifiers and ensemble learners to boost accuracy on classification results. We worked with two credit datasets, German dataset which is a public dataset and a Turkish Corporate Bank dataset. The goal of using such diverse datasets is to search for generalization ability of proposed model. Results show that feature selection plays a vital role on classification accuracy, hybrid approaches which shaped with ensemble learners outperform single classification techniques and hybrid approaches which consists SVM has better accuracy performance than other hybrid approaches. © 2018 Elsevier B.V., All rights reserved.
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    Credit risk analysis based on hybrid classification: Case studies on German and Turkish credit datasets, Hibrid Siniflandirma Yöntemleriyle Kredi Risk Analizi: Alman ve Türk Kredi Verisetleri Üzerinde Vaka Çalismalari
    (Institute of Electrical and Electronics Engineers Inc., 2018) Cetiner, Erkan; Kocak, Taskin; Güngör, Vehbi Çağrı; Cetiner, Erkan, Fen Bilimleri Enstitusu, Bahçeşehir Üniversitesi, Istanbul, Turkey; Kocak, Taskin, Fen Bilimleri Enstitusu, Bahçeşehir Üniversitesi, Istanbul, Turkey; Güngör, Vehbi Çağrı, Bilgisayar Mühendisliǧi, Abdullah Gül Üniversitesi, Kayseri, Turkey
    In finance sector, credit risk analysis plays a major role in decision process. Banks and finance institutions gather large amounts of raw data from their customers. Data mining techniques can be employed to obtain useful information from this raw data. Several data mining techniques, such as support-vector machines (SVM), neural networks, naive-bayes, have already been used to classify customers. In this paper, we propose hybrid classification approaches, which try to combine several classifiers and ensemble learners to boost accuracy on classification results. Furthermore, we compare these approaches' performance with respect to their classification accuracy. We work with two diverse datasets, namely, German credit dataset and Turkish bank dataset. The goal of using such diverse dataset is to show generalization capabality of our approaches. Experimental results provide three important consequences. First, feature selection stage has a major role both on result accuracy and calculation complexity. Second, hybrid approaches have better generalability over single classifiers. Third, using SVM-Radial Basis Function (RBF) as the base classifier and a hybrid model member gives the best accuracy and type-1 accuracy results among others. © 2018 Elsevier B.V., All rights reserved.