I have known Mr. Ehsan Fayyazishishavan over the last 6 years. He was one of my best students during his Ph.D. program (2014-2020) in the Faculty of Arts and Sciences (Dept. of Statistics) at the Yildiz Technical University. Mr. Fayyazishishavan impressed me with his high academic quality during his research as well as strong future potential for research area (activities). Additionally, he took ‘Statistical Programming’ and ‘Structural Equation Modelling in Statistics’ with me and passed them with a highest grade. I have found him as a diligent, hardworking, and very well-motivated student so that is able to adapt himself easily for group-working area. As the head of department with professional experience in academic and research areas, I believe that Mr. Ehsan Fayyazishishavan has a great academic potential which makes any university or research institute interested in choosing him. Therefore, I would recommend him to every university or research center as a suitable candidate with strong academic motivation and a brilliant academic future. With this letter, it is my great pleasure to recommend Mr. Ehsan Fayyazishishavan for the position he is applying for. Please contact me if you need any further details. Sincerely, Professor Gülhayat GÖLBAŞI ŞİMŞEK Yıldız Technical University, Department of Statistics Faculty of Arts & Sciences Davutpaşa Campus 34220 Esenler / Istanbul, TURKEY E-mail: gulhayat@yildiz.edu.tr Home: https://avesis.yildiz.edu.tr/gulhayat

I have known Mr. Ehsan Fayyazishishavan since his B.Sc. studies in 2008 when he took courses Mathematical Statistics and Final Project, the latter being a research project with me in which he outperformed excellently. Not only our acquaintance dates back to a long time ago, but also during our time together, he was my student in Seminar as well as Dissertation courses in the M.Sc. position. Noting that I was his thesis supervisor entitled

I have known Mr. Ehsan Fayyazishishavan over the last 6 years. He was one of my best students during his Ph.D. program (2014-2020) in the Faculty of Arts and Sciences (Dept. of Statistics) at the Yildiz Technical University. Mr. Fayyazishishavan impressed me with his high academic quality during his research as well as strong future potential for research area (activities). Additionally, he took ‘Statistical Programming’ and ‘Structural Equation Modelling in Statistics’ with me and passed them with a highest grade. I have found him as a diligent, hardworking, and very well-motivated student so that is able to adapt himself easily for group-working area. As the head of department with professional experience in academic and research areas, I believe that Mr. Ehsan Fayyazishishavan has a great academic potential which makes any university or research institute interested in choosing him. Therefore, I would recommend him to every university or research center as a suitable candidate with strong academic motivation and a brilliant academic future. With this letter, it is my great pleasure to recommend Mr. Ehsan Fayyazishishavan for the position he is applying for. Please contact me if you need any further details. Sincerely, Professor Gülhayat GÖLBAŞI ŞİMŞEK Yıldız Technical University, Department of Statistics Faculty of Arts & Sciences Davutpaşa Campus 34220 Esenler / Istanbul, TURKEY E-mail: gulhayat@yildiz.edu.tr Home: https://avesis.yildiz.edu.tr/gulhayat

I have known Mr. Ehsan Fayyazishishavan since his B.Sc. studies in 2008 when he took courses Mathematical Statistics and Final Project, the latter being a research project with me in which he outperformed excellently. Not only our acquaintance dates back to a long time ago, but also during our time together, he was my student in Seminar as well as Dissertation courses in the M.Sc. position. Noting that I was his thesis supervisor entitled

I have known Mr. Ehsan Fayyazishishavan over the last 6 years. He was one of my best students during his Ph.D. program (2014-2020) in the Faculty of Arts and Sciences (Dept. of Statistics) at the Yildiz Technical University. Mr. Fayyazishishavan impressed me with his high academic quality during his research as well as strong future potential for research area (activities). Additionally, he took ‘Statistical Programming’ and ‘Structural Equation Modelling in Statistics’ with me and passed them with a highest grade. I have found him as a diligent, hardworking, and very well-motivated student so that is able to adapt himself easily for group-working area. As the head of department with professional experience in academic and research areas, I believe that Mr. Ehsan Fayyazishishavan has a great academic potential which makes any university or research institute interested in choosing him. Therefore, I would recommend him to every university or research center as a suitable candidate with strong academic motivation and a brilliant academic future. With this letter, it is my great pleasure to recommend Mr. Ehsan Fayyazishishavan for the position he is applying for. Please contact me if you need any further details. Sincerely, Professor Gülhayat GÖLBAŞI ŞİMŞEK Yıldız Technical University, Department of Statistics Faculty of Arts & Sciences Davutpaşa Campus 34220 Esenler / Istanbul, TURKEY E-mail: gulhayat@yildiz.edu.tr Home: https://avesis.yildiz.edu.tr/gulhayat

I have known Mr. Ehsan Fayyazishishavan since his B.Sc. studies in 2008 when he took courses Mathematical Statistics and Final Project, the latter being a research project with me in which he outperformed excellently. Not only our acquaintance dates back to a long time ago, but also during our time together, he was my student in Seminar as well as Dissertation courses in the M.Sc. position. Noting that I was his thesis supervisor entitled