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            <front>

                <journal-meta>
                                    <journal-id></journal-id>
            <journal-title-group>
                                                                                    <journal-title>Gazi Journal of Economics and Business</journal-title>
            </journal-title-group>
                                        <issn pub-type="epub">2548-0162</issn>
                                                                                            <publisher>
                    <publisher-name>Aydın KARAPINAR</publisher-name>
                </publisher>
                    </journal-meta>
                <article-meta>
                                        <article-id pub-id-type="doi">10.30855/gjeb.2023.9.1.003</article-id>
                                                                <article-categories>
                                            <subj-group  xml:lang="en">
                                                            <subject>Finance</subject>
                                                    </subj-group>
                                            <subj-group  xml:lang="tr">
                                                            <subject>Finans</subject>
                                                    </subj-group>
                                    </article-categories>
                                                                                                                                                        <title-group>
                                                                                                                        <trans-title-group xml:lang="en">
                                    <trans-title>Estimating the systematic risks of Turkish airline companies listed in the BIST-100 Index</trans-title>
                                </trans-title-group>
                                                                                                                                                                                                <article-title>BIST-100 Endeksi’nde yer alan Türk Havayolu şirketlerinin sistematik risklerinin tahmin edilmesi</article-title>
                                                                                                    </title-group>
            
                                                    <contrib-group content-type="authors">
                                                                        <contrib contrib-type="author">
                                                                    <contrib-id contrib-id-type="orcid">
                                        https://orcid.org/0000-0003-0073-2095</contrib-id>
                                                                <name>
                                    <surname>Köse</surname>
                                    <given-names>Yaşar</given-names>
                                </name>
                                                                    <aff>TÜRK HAVA KURUMU ÜNİVERSİTESİ, İŞLETME FAKÜLTESİ</aff>
                                                            </contrib>
                                                    <contrib contrib-type="author">
                                                                    <contrib-id contrib-id-type="orcid">
                                        https://orcid.org/0000-0001-7040-4711</contrib-id>
                                                                <name>
                                    <surname>Aktan</surname>
                                    <given-names>Ceyda</given-names>
                                </name>
                                                                    <aff>TÜRK HAVA KURUMU ÜNİVERSİTESİ, İŞLETME FAKÜLTESİ</aff>
                                                            </contrib>
                                                                                </contrib-group>
                        
                                        <pub-date pub-type="pub" iso-8601-date="20230227">
                    <day>02</day>
                    <month>27</month>
                    <year>2023</year>
                </pub-date>
                                        <volume>9</volume>
                                        <issue>1</issue>
                                        <fpage>37</fpage>
                                        <lpage>50</lpage>
                        
                        <history>
                                    <date date-type="received" iso-8601-date="20220527">
                        <day>05</day>
                        <month>27</month>
                        <year>2022</year>
                    </date>
                                                    <date date-type="accepted" iso-8601-date="20230203">
                        <day>02</day>
                        <month>03</month>
                        <year>2023</year>
                    </date>
                            </history>
                                        <permissions>
                    <copyright-statement>Copyright © 2015, Gazi Journal of Economics and Business</copyright-statement>
                    <copyright-year>2015</copyright-year>
                    <copyright-holder>Gazi Journal of Economics and Business</copyright-holder>
                </permissions>
            
                                                                                                <trans-abstract xml:lang="en">
                            <p>In this study, the aim is to calculate and interpret the yearly β values of the two major airline companies listed in the BIST-100 Index using their daily stock returns. The data of these two airline companies (Turkish Airlines (THYAO) and Pegasus Air Transport Company (PEGSUS) were taken for the period from 2019 to 2021 and were used in creating single regression equations. It has been determined that the betas of both Turkish Airlines and Pegasus Air Transport were higher than the beta of the market (βm = 1) in years other than 2019, which means that the risk is also higher than the market risk. The average betas of the Turkish Airlines and Pegasus Air Transport Company within the examined years were calculated as 1.193 and 1.10, respectively. These results suggest that if there is a 1% increase in the market return; there will be an increase of approximately 1.2% in the shares of Turkish Airlines and approximately 1.10 % in the shares of Pegasus Air Transport Company.</p></trans-abstract>
                                                                                                                                    <abstract><p>Bu çalışmada BIST-100 Endeksinde yer alan Türk Hava Yolları Anonim Ortaklığı (THYAO) ve Pegasus Hava Taşımacılığı Anonim Şirketi (PEGSUS) hisse senetlerinin 2019-2021 yılları arasındaki günlük getirileri üzerinden, ayrı ayrı her yıla ait β değerleri tekli regresyon denklemleri oluşturularak ve βi = Cov (im)/(σ2m) denklemi kullanılarak hesaplanması ve yorumlanması amaçlanmaktadır. Pegasus Hava Taşımacılığı Anonim Şirketi’nin 2019 yılı hariç diğer yıllarda hem Türk Hava Yolları Anonim Ortaklığı’nın hem Pegasus Hava Taşımacılığı Anonim Şirketi’nin betaları pazarın betasından (βm = 1) daha yüksek olduğu tespit edilmiş olup bu da riskin de pazar riskine göre daha fazla olduğuna işaret etmektedir. İncelenen yılların ortalama betaları sırasıyla; Türk Hava Yolları Anonim Ortaklığı ve Pegasus Hava Taşımacılığı Anonim Şirketi’nin 1,193 ve 1,10’dur.  Bu sonuçlara göre piyasa getirisinde %1’lik bir artışta; Türk Hava Yolları Anonim Ortaklığı hisse senedinde yaklaşık %1,2’lik, Pegasus Hava Taşımacılığı Anonim Şirketi hisse senedinde yaklaşık %1,10’luk bir artış olacaktır.</p></abstract>
                                                            
            
                                                                                        <kwd-group>
                                                    <kwd>BIST-100 Endeksi</kwd>
                                                    <kwd>  Sistematik Risk</kwd>
                                                    <kwd>  Beta Katsayısı</kwd>
                                            </kwd-group>
                            
                                                <kwd-group xml:lang="en">
                                                    <kwd>BIST-100 Index</kwd>
                                                    <kwd>  Systematic Risk</kwd>
                                                    <kwd>  Beta Coefficent</kwd>
                                            </kwd-group>
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                                </article-meta>
    </front>
    <back>
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