19 Şubat 2017

Özgeçmiş

Dr. Onur TOKA

Department of Statistics,

Hacettepe University, 06800

Ankara, Turkey

Phones: +90312 780 7806

+90312 299 2016-123

Fax:       +90312 297 7913

Page:     www.onurtoka.com.tr

E-mail:   onur.toka@hacettepe.edu.tr

Education

Ph. D., Department of Statistics, Hacettepe University (3.83/4.00), 2012-2016.

                     Ph. D. Thesis Title: Gudermannian Loss Function and GudermannianBoost Binary Classification Method (In Turkish)

M. Sc., Department of Statistics, Hacettepe University (3.93/4.00), 2009-2012

                      M.Sc. Thesis Title: Robust Estimation in Case of Missing Data (In Turkish)

B. Sc., Department of Business, Faculty of Business, Anadolu University, 2006-2011.

B. Sc., Department of Statistics, Hacettepe University (3.41/4.00), 2004-2009.

High School, Sincan Foreign Language Intensive HS, Ankara, 2000-2004.

Academic Experience

Research Assistant Dr.

Department of Statistics, Hacettepe University, 2016-Present

Research Assistant

Department of Statistics, Hacettepe University, 2009-2016.

Non-Academic (Part Time) Experience

Trainee Inspector

Turkish Accreditation Agency, 2017-Present

Technical Expert

Turkish Accreditation Agency, 2014-2017

Research Interest

Missing Data, Imputation Methods, Simulation, Robust Statistics, Model Selection Methods, Data Mining, Classification.

Books

2007-2012 Anne ve Bebek Ölümlerinin Değerlendirilmesi Raporu, T. C. Sağlık Bakanlığı Türkiye Halk Sağlığı Kurumu, ISBN : 978 – 975 – 590 – 560 -0, Ankara, 2014. Editör: M. Rıfat KÖSE, 251 sayfa.

Papers

Kaya, S., Sain Guven, G., Aydan, S., Kar, A., Teleş, M., Yıldız, A., Koca, Gülsüm ş, … & Toka, Onur (2018). Patients’ readiness for discharge: Predictors and effects on unplanned readmissions, emergency department visits and death. Journal of nursing management (Indexed in SCI)

Kaya, S., Guven, G. S., Aydan, S., & Toka, O. (2018). A comprehensive framework identifying readmission risk factors using the CHAID algorithm: a prospective cohort study. International Journal for Quality in Health Care.(Indexed in SCI)

Toka, O. and Çetin, M. (2018), A Correction on TangentBoost Algorithm, Communications Series A1 Mathematics & Statistics67(2).(Indexed in ESCI)

Korkmaz, P.,  Erarslan, S. &Toka, O. (2017), Evaluation of the Association Between the Neutrophil to Lymphocyte Ratio and Mortality in the Patients Followed up with the Diagnosis of Sepsis, Journal of Clinical Anal Medicine, 8.(3):211-215. Indexed in ESCI.

Aslaner, R., Pekcevik, Y., Sahin, H., & Toka, O. (2017). Variations in the Origin of Inferior Phrenic Arteries and Their Relationship to Celiac Axis Variations on CT Angiography. Korean Journal of Radiology, 18(2), 336-344. Indexed in SCI.

Korkmaz, P., Caglan, F. C., Aykin, N., Hasan & Toka, O. (2016). Real-life outcomes of tenofovir disoproxil fumarate monotherapy in nucleos (t) ide analogue-naive and nucleos (t) ide analogue-experienced chronic hepatitis B patients: a single-center experience. Viral Hepatit Dergisis, 22(3), 92. Indexed in ESCI.

Toka, O. (2016). A Comparative Study on Regression Methods in the presence of Multicollinearity, Journal of Statisticians: Statistics and Actuarial Sciences, 9, 2, 47-53. Indexed in CIS.

Toka, O., & Çetin, M. (2016). Imputation and Deletion Methods under the Presence of Missing Values and Outliers: A Comparative Study. Gazi University Journal of Science, 29(4), 799-809. Indexed in ESCI.

Korkmaz, P., Uyar, C., Ozmen, A., & Toka, O. (2016). Knowledge and Attitude of Health Care Workers toward Patients with Hepatitis C Infection. Southeast Asian Journal of Tropical Medicine and Public Health, 47(5), 935-944. Indexed in SCI-Expanded.

Şanlier, N., Türközü, D., & Toka, O. (2016). Body image, food addiction, depression, and body mass index in university students. Ecology of Food and Nutrition, 55(6), 491-507. Indexed in SCI-Expanded.

Akbulut, G., Gezmen‑Karadağ, M., Ertas, Y., Uyar, B. B., Yassibas, E., Türközü, D. Çelebi, F., Paşaoğlu, Ö. T., Toka, O.,  Yildiran, H., Şanlıer  & Şanlier, N. (2014). Plasma orexin‑A and ghrelin levels in patients with chronic obstructive pulmonary disease: Interaction with nutritional status and body composition. Experimental and therapeutic medicine, 7(6), 1617-1624. Indexed in SCI-Expanded.

Toka, O., Çetin, M. & Altunay, S. A. (2011). Basit Doğrusal Regresyonda Sağlam ve Theil Kestiricilerinin Karşılaştırılması. İstatistik Araştırma Dergisi, 8, 3, 45-53. Indexed in Akademia Sosyal Bilimler Indeksi (ASOS).

Çetin, M. & Toka, O. (2011). The Comparing of S-estimator and M-estimators in Linear Regression. Gazi University Journal of Science, 24(4), 747-752. Indexed in Scopus.

Presentations (International) –Oral

Toka, O., Erar, M. Aydın, Çetin M., Variable Seletion in Polynomial Regression and a model of minimum Temperature in Turkey, International 10th. Statistics Congress, December 6-8 1,2017, ANKARA.

Toka, O., Tuaç, Y., Çetin, M. & Arslan, O., 2017, Robust variable selection in restricted linear regression model, European Meeting of Statistics,04-08 July 2017, Helsinki, FINLAND.

Toka, O., Cetin, M., 2017, A Comparison of Gudermannianboost Binary Classification Method and Logistic Regression Using Propensity Score, Toka, O., Çetin M., Loss Functions in Classification: A Comparative Study, 2nd International Researchers, Statisticians and Young Statisticians Congress(IRSYSC2017), 24-28 May 2017, Konya, TURKEY.

Toka, O., Çetin, M., 2016, Robust Boosting Algorithm GudermannianBoost.  Applied Statistics 2016, SLOVENYA.

Kaya, S., Sain Güven, G., Karsavuran S.,Toka, O., Identifying Risk Factors for Readmission using Desicion Tree Analysis, World Academy of Science, Engineering and Technology, 2831-2831, 2016, İNGİLTERE

Toka, O., Çetin M., Arslan, O., Robust Regression Methods with Prior Information: Restricted Robust Regression Method, International Conference on Information Complexity and Statistical Modeling in High Dimensions with Applications (IC-SMHD 2016), May 18-21, 2016., NEVŞEHİR.

Toka, O., Çetin M., Robust Properties of Some Loss Functions in Classification, International Conference on Information Complexity and Statistical Modeling in High Dimensions with Applications (IC-SMHD 2016), May 18-21, 2016., NEVŞEHİR.

Toka, O., Çetin M., Loss Functions in Classification: A Comparative Study, 2nd International Researchers, Statisticians and Young Statisticians Congrees(IRSYSC2016), May 4-8, 2016, ANKARA.

Toka, O., Çetin M., Comparison of Some Imputation and Deletion Methods through MSE of Mean Estimation, International 9th. Statistics Congress, October 28- November 1,2015, ANTALYA.

Toka, O., Çetin, M. Comparison of Some Regression Methods in case of Multicollinearity, XVI. International Symposium on Econometrics, Operations Research and Statistics, May 7-12,2015, EDİRNE.

Toka, O., Çetin M., Arslan O., A study of AIC and BIC based on robust estimators, 3rd International Eurasian Conference on Mathematical Sciences and Applications, 25-28 August 2014, Vienna- AUSTRIA.

Toka, O., Arıkan, C., Some suggestions for missing data problem in data envelopment analysis: Effectiveness of Health, XV. International Symposium on Econometrics, Operations Research and Statistics,May 22-25,2014, ISPARTA

Toka, O., Ünlü, H., Çetin, M., Outlier Problems in Regression Models with multicollinearity, XV. International Symposium on Econometrics, Operations Research and Statistics,May 22-25,2014, ISPARTA.

Arıkan, C., Toka, O., Applying Some Econometric Methods On Some Turkish Economic Variables And Simulation, International 7th. Statistics Congress, 27 -30 October,2013, ANTALYA

Çetin, M., Toka, O., Altunay, S.A., LASSO Selection in Economic Growth Rate Models: The Case of Turkey, XIV. International Symposium on Econometrics, Operations Research and Statistics, May 24-28, 2013, SARAJEVO, BOSNIA-HERZEGOVINA.

Toka, O., Çetin, M., Some Missing Data Methods with Bootstrapping, XIV. International Symposium on Econometrics, Operations Research and Statistics, May 24-28, 2013, SARAJEVO, BOSNIA-HERZEGOVINA.

Toka, O., Çetin, M., Comparison of Some Classic and Robust Imputations, 8th International Symposium of Statistics, October 11-13, 2012, ESKISEHIR.

Toka, O., Arıkan, C., Determining the Effects of Oil Prices on Investments- a Gross Domestic Product Component-by Threshold Autoregressive Model, 8th International Symposium of Statistics, October 11-13, 2012, ESKISEHIR.

Presentations (National) –Oral

Korkmaz, P., Demirtürk, N., Çınar Aydın, G., Çeken, S., Aygen, B., Toka, O., Gündoğdu, K. vd., Ülkemizde İmmunsupresif Tedavi Veren Hekimlerin Hepatit B Reaktivasyonu ile İlgili Farkındalık ve Klinik Pratiklerinin Değerlendirilmesi, 7. Tepecik Enfeksiyon Günleri, 1-5 Kasım 2017, Dalaman, Muğla.

Korkmaz, P., Erarslan S., Toka, O., Eritrosit Dağılım Genişliği Sepsis ve Septik Şoku Hastalarda Moralite için Prognastik bir Faktördür, KLİMİK 2017 30. Yıl Kurultayı, 22-26 Mart 2017, Antalya.

Kaya, S. Sain Güven, G., Aydan, S., Toka, O., 2016,  İç Hastalıkları Servislerinden Taburcu Olan 65 Yaş ve Üzeri Hastaların Hastaneye Yeniden Yatışlarının Değerlendirilmesi.  10. Sağlık ve Hastane İdaresi Kongresi, December 1-3, 2016, ANKARA.

Korkmaz, P., Uyar, C., Özmen, A., Toka, O., 2016, 3.  Basamak Bir Hastanede Görev Yapan Sağlık Çalışanlarının Hepatit C Hakkında Bilgi Düzeyi ve Hepatit CEnfeksiyonu Olan Hastalara Karşı Tutumlarının Değerlendirilmesi.   Klimik 30. Yıl Kurultayı, March 9-12, 2016, ANTALYA.

Ayyıldız F., Toka, O., Köktürk, O., Rakıcıoğlu, N., 2015, Obstrüktif Uyku Apne Sendromu Ağırlığı ile Beslenme Durumu ve Bazı Antropometrik Ölçümlerin İlişkisi, 37. Ulusal Solunum Kongresi, October 17-21, 2015, İZMİR.

Toka, O., Çetin, M., Comparison of Data imputation Methods in Linear Regression Analysis,  I. Young Statisticians Symposium, 10-11 September 2013, ANKARA.

Presentations (Poster)

Gezme-Karadağ M, Akbulut G, Türközü D, Çelebi F, Yassıbaş E, Barut-Uyar B, Ertaş Y, Paşaoğlu ÖT, Toka O, Aktürk MJ, Şanlıer N., Uyku Süresi ve Kalitesi: Beslenme Durumu, Plazma Oreksin A ve Ghrelin Düzeyleriyle İlişkili midir? , Uluslararası Katılımlı Türkiye Doğal Beslenme ve Yaşam Boyu Sağlık Zirvesi,May 20-23, 2015, BILECİK.

Çelebi, F., Toka, O., Köktürk, O., Rakıcıoğlu, N., Is Obstructive Sleep Apnea Level Related with Anthropometric Measurements and Body Composition? 22nd European Congress on Obesity (ECO2015), May 6-9, 2015, Prague, CZECH REBUBLIC. **** Extended Abstracts in Obes Facts 2015;8(suppl 1):1-272, (DOI:10.1159/000382140), Indexed in SCI-Expanded.

Toka, O., Çetin, M., A study on Classical and Robust Variable Selection, International 7th. Statistics Congress, 27 –30 September ,2013, ANTALYA

Toka, O., Çetin, M., Altunay, S. A., Comparison of Robust and Theil Estimators in Simple Linear Regression, International 7th. Statistics Congress, April 28- May 1,2011, ANTALYA.

Assisted Courses

Data Analysis (2009-2010; 2016-Present)

Statistics (2013-Present)

Applied Numerical Analysis (2010- Present)

Introduction to Statistics (2010-2013)

Regression Analysis (2009 – Present)

Attending Conferences 

Applied Statistics 2016, September 18-21, 2016, Slovenia.

International Conference on Robust Statistics (ICORS 2016), July 4-8,2016, Geneva, Switzerland.

2nd International Researchers, Statisticians and Young Statisticians Congrees (IRSYSC2016), May 4-8, 2016, ANKARA.

International Conference on Information Complexity and Statistical Modeling in High Dimensions with Applications (IC-SMHD 2016), May 18-21, 2016., NEVŞEHİR.

International 9th. Statistics Congress, October 28- November 1,2015, ANTALYA.

16th International Symposium on Econometrics, Operation Research and Statistics, May 7-12,2015, EDİRNE

3rd International Eurasian Conference on Mathematical Sciences and Applications, 25-28 August 2014, Vienna- AUSTRIA.

International Symposium on Econometrics, Operations Research and Statistics, May 22-25,2014, ISPARTA

International 8th Statistics Congress, October 27-30,2013, ANTALYA.

Researchers and Statisticians Conference,12-13 September 2013, Ankara, Turkey,

Young Statisticians Symposium, 10-11 September 2013, Ankara, Turkey,

XIV. International Symposium on Econometrics, Operations Research and Statistics, May 24-28, 2013, SARAJEVO, BOSNIA-HERZEGOVINA.

8th International Symposium of Statistics, October 11-13, 2012, ESKISEHIR.

International 7th. Statistics Congress, April 28- May 1,2011, ANTALYA.

Fellowship-Award

Researcher of the Year, Journal of Clinical ana Analytical Medicine, January 26, 2018, ANKARA.

Best Paper Award, 7. Tepecik Enfeksiyon Günleri, 1-5 Kasım 2017, Dalaman, MUĞLA.

Best Paper Award, 10th Congress of Health and Hospital Administration, 1-3 December, 2016, Başkent University, ANKARA.

TÜBİTAK Domestic PhD scholarship, 2012- 2016.

Professional Assosciation Activities

Member of Supervising Council, Hacettepe University Alumni Association (2011-2013).

General Secretary of Hacettepe University Students’ Statistical Association (2008-2009).

Member of Turkish Statistical Association (2014- Present)

Student Member of Institute of Mathematical Statistics (2014-2017)

Membership

Turkish-Hungarian Friendship Association (2017-Present).

            Board Member (2017-Present).

Turkish Aeronautical Association (2015-Present).

Board Assistant Member (2015-2017).

Volunteer for The Turkish Foundation for Combating Soil Erosion  For Reforestation and the Protection of Natural Habitats (TEMA) (2012-Present).

Hacettepe University Alumni Association (2011-Present).

Supervisory Council Member(2011-2013).

Association of Kemalist Thought (2007-Present).

General Board Member (2011-2012), General Secretary of the Youth Organization (2008-2010),  President of Youth Organization in Sincan (2007-2008).

Scientific Activities

Member of Scientific Board, 15th International Statistical Student Colloquium, May4-5, 2018, İstanbul.

Member of Organizing Committee, 10nd International Statistics Congress December 6-8, 2017, Ankara.

Member of Scientific Board, 14nd International Statistical Student Colloquium, April 20-21, 2017, Eskişehir.

Member of Organizing Committee, 2nd International Researchers, Statisticians and Young Statisticians Congress (IRSYSC2016),May 4-8, 2016, Ankara.

Member of Organizing Committee, Researchers and Statisticians Conference, 12-13 September 2013, Ankara.

Member of Organizing Committee, Young Statisticians Symposium, 10-11 September 2013, Ankara.

Languages

English – Understanding: Very Good; Speaking: Good; Writing: Good, (KPDS: 75/100, ÜDS: 71.5/100, YÖKDİL: 81,25/100)

Internships

Turkish Statistical Institute, Ankara, Turkey.

Ziraat Bank, Sincan, Ankara, Turkey.

Other Activities

Member of the Board of Directors Hacettepe University Students’ Representative Council (2009)

Representative of Students in Faculty of Science (2009)

Representative of Students in Department of Statistics (2009)

Officer of Hacettepe University Publicity Days (2010-2010)

Advisor of 68 Undergraduate Students. (2011-2013)

Representative for graduate students in Department of Science (2012-2014)

Coordinator of Department for Schedule and Test (2012-2016)

Coordinator of Department for Hacettepe University Traditional Sports Festival (2013-2016)

Representative of research assistants in Department of Science (2013)

Assistant of Coordinator of Department for FEDEK (“Association for Evaluation and Accreditation of programs in Faculties of Science, Arts, Arts and Science, Letter and History-Geography) (2016-Present)

Statistics Department Web Site Manager (2016-Present)

Assistant Coordinator of Science of Faculty for Hacettepe University Traditional Sports Festival (2016-2017)

Advisor of 28 Undergraduate Students. (2017-Present)

Advisor of Hacettepe University Statistics Community (2017-Present)

Manager of Social Cites of Department (2018-Present)