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ÇAĞLAYAN AKAY, EBRU

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    PublicationOpen Access
    Health econometrics research: A bibliometric analysis from 1991 to 2020
    (2023-06-01) ÇAĞLAYAN AKAY, EBRU; ERGÜT, ÖZLEM; Çağlayan Akay E., Ertok Onurlu M., Ergüt Ö.
    As a discipline, econometrics provides quantitative insights for many fields of economics, and as a result, many subfields of econometrics have emerged over time. “Health Econometrics” is one of those subfields, which employs econometric theory for the issues in health economics. The number of studies gathering econometrics and health economics, and thereby health econometrics, increased over time, particularly during the 1990s. There is a substantial body of literature in health economics that shares insights on published materials. However, the number of research that use bibliometric analysis to study trends and the present state of health econometrics is limited. This research intends to investigate published materials in health econometrics from a variety of perspectives. To do this, data from publications with appropriate subject characteristicsin the EconLit database were collected between January 1991 and December 2020. The primary methodologies in the study were bibliometric analysis and scientific mapping. The overall findingsindicate that the number of publications has grown significantly over the previous 60 years, with the highest contributing writers primarily based in American institutions. In other words, health econometrics is gaining popularity among academics in the United Kingdom and the United States.
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    PublicationOpen Access
    Relationship between tourism and economic growth a granger causality panel data approach
    (2012-09-01) ÇAĞLAYAN AKAY, EBRU; ŞAK, NAZAN; Çağlayan Akay E., Şak N., Kamal K.
    This paper investigated the causal relationship between tourism revenue and gross domestic product (GDP) using the panel data of 135 countries for the period 1995–2008. For this purpose, Panel Granger causality analysis was applied to 11 groups of countries. This classification was created as America (30 countries), Asia (34 countries), Europe (37 countries), East Asia (13 countries), South Asia (6 countries), Central Asia (5 countries), Latin America & Caribbean (28 countries), Oceania (7 countries), Middle East & North Africa (11 countries), Sub Saharan Africa (24 countries) and the world (135 countries). Results indicated bidirectional causality in Europe between tourism revenue (TR) and gross domestic product (GDP). Findings showed that there is a unidirectional causality in America, Latin America & Caribbean and World from GDP to tourism revenue. While in case of East Asia, South Asia and Oceania the reverse direction of causality was found from tourism revenue to GDP. No causal relationship was found in Asia, Middle East and North Africa, Central Asia and Sub Saharan Africa.
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    PublicationOpen Access
    Küreselleşme ve geli̇r ili̇şki̇si̇ne farklı bi̇r bakış: parametri̇k ve semi̇parametri̇k yaklaşım
    (İstanbul University Press, 2021-01-01) KIZILARSLAN, ŞABAN; ÇAĞLAYAN AKAY, EBRU; GÜRİŞ S., ÇAĞLAYAN AKAY E., KIZILARSLAN Ş.
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    PublicationOpen Access
    Identifying tourism and economic growth nexus the hurlin venet approach
    (2013-04-01) ÇAĞLAYAN AKAY, EBRU; ŞAK, NAZAN; Çağlayan Akay E., Şak N., Kamal K.
    This paper seeks to identify causality between tourism and economic growth within Hurlin-Venet approach using the panel data of 135 countries for the period 1995–2008. Countries are classified by income levels. The unidirectional causality from economic growth to tourism revenue is found only in case of high income countries group.
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    PublicationOpen Access
    Hanehalkı Tüketim Harcamalarının Mikroekonometrik Analizi:_x000D_ LAD-LASSO Yöntemi
    (2021-01-19) ÇAĞLAYAN AKAY, EBRU; Kadriye Hilal TOPAL;Ebru ÇAĞLAYAN AKAY
    Bu çalışmanın amacı, denetimli makine öğrenmesi yöntemlerinin aşırı değer ve uzun kuyruklu hatalara sahip HanehalkıBütçe Anketi Hane veri setinin ilgili değişkenlerini seçmemize nasıl yardımcı olduğunu incelemek ve Türkiye’nin HanehalkıTüketimHarcamaları’nın tahmininde en iyitahmin ve öngörü performansına sahip olanmodelin belirlenmesinisağlamaktır.Bu amaçla, 2018 yılı Türkiye’nin Hanehalkı Bütçe Anketi Hane veri seti klasik regresyon yönteminin yanı sıra En KüçükMutlak Sapma (LAD), En Küçük Mutlak Küçültme ve Seçim Operatörü (LASSO) ve LAD-LASSO yöntemleri kullanılarakincelenmiş ve yöntemlerin tahmin ve öngörü performansları karşılaştırılmıştır. Analiz sonuçlarına göre; uzun kuyrukluhataların varlığında dayanıklı tahminciler elde edilirken aynı zamanda değişken seçimine olanak sağlayan LAD-LASSOmakine öğrenmesi yönteminin tahmin performansı ve öngörü açıklığı açısından en başarılı yöntem olduğu sonucunaulaşılmıştır. Ayrıca gelir, tasarruf ve hane halkı büyüklüğü gibi bazı temel değişkenler tüm modeller için hanehalkı tüketimharcamalarını artırmaktadır. Bu değişkenlere ek olarak odanın yapısı, mutfak, banyo zeminleri, ısıtma, klima tercihleri,kullanılan enerji kaynakları, müstakil ev, apartman, yazlık, bağ sahipliği ve yatırım tercihleri, kredi kartı kullanımı, internetalışveriş alışkanlıkları gibi çeşitli değişkenler LAD-LASSO modelinde hane halkı tüketim harcamalarının belirleyicileriolarak seçilmiştir. Çalışma sonuçlarından, makine öğrenme algoritmalarının mikroekonometrik modellerin oluşturulmasısırasında gerekli değişkenlerin seçiminde kullanılabileceğine dair bulgular elde edilmiştir. Bu çalışma doktora tezindenüretilmiştir.
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    PublicationOpen Access
    Students in Turkey during the early days of the COVID-19 pandemic
    (2023-02-01) ÇAĞLAYAN AKAY, EBRU; DUMLUDAĞ, DEVRİM; BÜLBÜL, HOŞENG; ZÜLFÜOĞLU, ÖZKAN; ÇAĞLAYAN AKAY E., DUMLUDAĞ D., BÜLBÜL H., ZÜLFÜOĞLU Ö.
    This study aims to analyse the subjective well-being of university students during the early days of the COVID-19 pandemic process and to examine how students have been affected economically, psychologically and socially. Other subjects included in the scope of the study are the suitability of the physical conditions during the process of online education, the students\" motivation, and their expectations towards the future. The study also analyses the connection between these factors and the subjective well-being concepts of happiness and life satisfaction. The study focuses on students of the Faculty of Economics at Marmara University in Turkey. In total, 428 students took part in the survey prepared for the study. Descriptive analyses indicate that students have been negatively affected in terms of psychological and socio-economic factors along with subjective well-being. Ordered probit models show a statistically significant relationship between a major part of these changes and subjective well-being variables.
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    PublicationOpen Access
    Identifying the systemically important banks of Turkey with the CoVaR method
    (ELSEVIER SCI LTD, 2020-09) ÇAĞLAYAN AKAY, EBRU; Civan, Zehra; Simsek, Gulhayat Golbasi; Akay, Ebru Caglayan
    The purpose of this paper is to measure the systemic risk contributions of Turkish banks and to identify the systemically important banks of Turkey during the period from 2005 to 2016. We apply the conditional value-at-risk (CoVaR) method proposed by Adrian and Brunnermeier (2009) using quantile regression. The study includes thirteen major banks of Turkey, including both public and private banks, out of a total of 52 banks. The banks are ranked in terms of their systemic risk contribution to the Turkish financial system based on their asset returns, macroeconomic variables and individual bank variables. The study reveals that Akbank, Garanti, Yapi Kredi and Isbank have the highest systemic risk contribution to the financial system when adding macroeconomic variables to the model. This ranking is changed to Yapi Kredi, Garanti, TEB, Sekerbank and Akbank when taking into account bank-specific variables. One surprising result is that risk in isolation and the spillover risks of public banks are smaller than in large private banks. Furthermore, the marginal systemic risk contributions of public banks are smaller than those of private banks. In conclusion, authorities improve the regulatory framework according to the context of CoVaR in addition to monitor the idiosyncratic risks of banks.
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    PublicationOpen Access
    What does Bayesian probit regression tell us about Turkish female- and male-headed households poverty?
    (2017-05) ÇAĞLAYAN AKAY, EBRU; Çağlayan-Akay, Ebru; Sedefoğlu, Gülşah
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    PublicationOpen Access
    Gender wage gap among couples and the role of parenthood across the wage distribution in Turkey
    (2023-04-01) ÇAĞLAYAN AKAY, EBRU; Çağlayan Akay E., Kömüryakan F.
    The gender wage gap and the penalty of parenthood on wages are still major economic and sociological problems, especially in developing economies. This study aims to fll the void in the literature by analyzing the gender wage gap among couples and the role of parenthood across the unconditional wage distribution in the Turkish labor force. In accordance, 1198 families which include working-married-couples with and without children from the Turkish Household Budget Statistics survey data for 2018 are examined via unconditional quantile regression and decomposition methods. The fndings provide insights into three problems of the labor force gender wage gap among couples, the role of parenthood on wages, and the variation of them across the wage distribution. The fndings reveal a gender wage gap among couples and the gap is wider for the lower-paid employees. Lower-paid females face a wider motherhood wage penalty whereas fatherhood is mostly insignifcant on the males' wages. However, interestingly, fatherhood becomes a signifcant wage penalty for the highest-paid males.
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    PublicationOpen Access
    Students in Turkey during the early days of the COVID-19 pandemic
    (2022-11-01) ÇAĞLAYAN AKAY, EBRU; DUMLUDAĞ, DEVRİM; ZÜLFÜOĞLU, ÖZKAN; BÜLBÜL, HOŞENG; Çağlayan Akay E., Dumludağ D., Bülbül H., Zülfüoğlu Ö.
    This study aims to analyse the subjective well-being of university students during the early days of the COVID-19 pandemic process and to examine how students have been afected economically, psychologically and socially. Other subjects included in the scope of the study are the suitability of the physical conditions during the process of online education, the students’ motivation, and their expectations towards the future. The study also analyses the connection between these factors and the subjective well-being concepts of happiness and life satisfaction. The study focuses on students of the Faculty of Economics at Marmara University in Turkey. In total, 428 students took part in the survey prepared for the study. Descriptive analyses indicate that students have been negatively afected in terms of psychological and socio-economic factors along with subjective well-being. Ordered probit models show a statistically signifcant relationship between a major part of these changes and subjective well-being variables