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    Öğe
    Classification Based on Structural Information in Data
    (Springer Heidelberg, 2022) Karabulut, Bergen; Arslan, Guvenc; Unver, Halil Murat
    Clustering provides structural information from unlabeled data. The studies in which the structural information of the dataset is obtained through unsupervised learning approaches such as clustering and then transferred to the supervised learning are noteworthy. In this study, we propose a new preprocessing method, which obtains structural information that is expected to represent the most meaningful summary of the training dataset before applying a supervised learning strategy. To obtain this summary, the CURE clustering method was used. The proposed preprocessing method combined with SVM and a new classification method named representative points based SVM (RP-SVM) was developed. This new method was experimentally tested with various real datasets and was compared with the standard SVM, KMSVM, KNN and CART methods. The RP-SVM has significantly reduced the training size and resulted in less support vectors compared to standard SVM while achieving similar accuracy results. The RP-SVM has achieved better accuracy with less training data compared to KNN and CART. In addition, the RP-SVM has less data reduction compared to the KMSVM, but it is a more stable method that performs well in all datasets used. The results show that the proposed method can extract structural information that provides high quality for classification.
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    Öğe
    Parameter estimation of some Kumaraswamy-G type distributions
    (Springer Heidelberg, 2017) Arslan, Guvenc; Oncel, Sevgi Yurt
    Since Kum-G distributions have additional two parameters, the estimation of parameters becomes an interesting problem by itself. In this study, we consider parameter estimation of Kum-Weibull, Kum-Pareto and Kum-Power distributions by using the maximum likelihood and the maximum spacing methods. These three distributions are important in reliability and other applications. The Kum-Pareto and Kum-Power distributions have parameterdependent boundaries, which makes the estimation of parameters more interesting. We performed simulations for each of these considered distributions by using the R software for estimating parameters using the maximum likelihood and the maximum spacing method. In addition, an application of these distribution families to real data for modeling wind speed in a particular location in Turkey is discussed.