FACULTY of ARTS AND SCIENCESDEPARTMENT OF STATISTICS


ÖZLEM İLK DAĞ

Picture of the person
Assoc. Prof. ÖZLEM İLK DAĞ
Room No: 
134
Telephone: 
+90 (312) 210-5326
Fax No: 
+90 (312) 210-2959
E-mail: 
oilk@metu.edu.tr
Document: 
Education: 
  • Ph.D.: Department of Statistics, Iowa State University, USA, 2000-2004
  • M.S.: Department of Statistics, Iowa State University, USA, 1998-2000
  • B.S.: Department of Statistics, Middle East Technical University, Turkey, 1994-1997


Academic and Professional Experience:


  • Associate Professor (by university), Department of Statistics, Middle East Technical University, Ankara, Turkey (November 2013-present) 

  • Associate Professor (by YOK), Department of Statistics, Middle East Technical University, Ankara, Turkey (December 2012-present) 
  • Affiliated Faculty Member, Actuarial Sciences Program, Institute of Applied Mathematics, Middle East Technical University, Ankara, Turkey (September 2008-present) 
  • Vice Chair Person, Department of Statistics, Middle East Technical University, Ankara, Turkey (24 December 2012-11 March 2015) 
  • Assistant Professor, Department of Statistics, Middle East Technical University, Ankara, Turkey (July 2010-December 2012) 
  • Instructor, Department of Statistics, Middle East Technical University, Ankara, Turkey (September 2004- July 2010)
  • Research Assistant, Department of Statistics, Middle East Technical University, Ankara, Turkey (1997-2004)
  • Expert researcher (part-time), TUBITAK (The Scientific and Technological Research Council of Turkey), Division of Science, Technology and Innovation Policies and Strategies (June 2009-May 2010)
  • Assistant editor of Journal of Statistical Research (Turkey), TUIK, Ankara, Turkey (July 2007 - ) 
  • Advisory Board, Journal of Biostatistics, Turkish Clinics (2009-) 
  • Summer Internship Coordinator, Department of Statistics, Middle East Technical University, Ankara, Turkey (July 2011 -) 
  • General secretary & Treasurer of EMR-IBS (Eastern Mediterranean Region -International Biometric Society) (May 2007 - May 2009) 
  • The country representative of EMR-IBS (Eastern Mediterranean Region - International Biometric Society) (May 2005- May 2007) 
Research Interests: 
  • Longitudinal (panel) data
  • Multilevel modeling
  • Interactive (dynamic) graphics
  • Statistical computing
  • Bayesian data analysis
  • Statistics for microarrays 
 
 Teaching Interests:

  • Statistical Data Analysis
  • Biostatistics
  • Application in Statistics


Selected Publications: 
Books
  • Ilk, O. (2015) R Yazilimina Giris, 2. baski. ODTU Yayincilik (METU Press), Ankara, Turkiye. 
  • Ilk, O. (2011) R Yazilimina Giris. ODTU Yayincilik (METU Press), Ankara, Turkiye.
  • Ilk, O. (2008) Multivariate Longitudinal Data Analysis. Verlag Dr. Muller (VDM), Saarbrucken, Germany. ISBN: 978-3639072549
 
Chapter in Book

  • Ilk, O. (2007) "Panel Data Analysis" in "Recent Advances in Statistics", Turkish Statistical Institute Press, Chapter 11, pp. 141-147. ISBN: 978-975-01606-0-8.
 
Articles
  • Kayaoglu, G., Gürel, M., Saricam, E., Ilhan, M.N., Ilk, O. (2016) Predictive Model of Intraoperative Pain during Endodontic Treatment: Prospective Observational Clinical Study. Accepted to be published in Journal of Endodontics.
  • Asar, O., Ilk, O., Dag, O. (2016?) Estimating Box-Cox Power Transformation Parameter Via Goodness-of-Fit Tests. Accepted to be published in Communications in Statistics - Simulation and Computation. 
  • Asar, O., Ilk, O. (2016?) First-order marginalised transition random effects models with probit link function. Accepted to be published in Journal of Applied Statistics. 
  •  Asar, O., Ilk, O. (2016) Forecasting multivariate longitudinal binary data with marginal and marginally specified models. Journal of Statistical Computation and Simulation, 86:2, 414-429. 
  • Ilk, O., Pekkurnaz, D., Cinko, M. (2014) Modeling company failure: a longitudinal study of Turkish banks. Optimization: A Journal of Mathematical Programming and Operations Research, 63:12, 1837-1849. 
  • Inan, G., Ilk-Dag, O., de Leon, A.R. (2014) Letter to Editor Re: "Logistic regression with multiple random effects: A simulation study of estimation methods and statistical packages," by Y. Kim, Y-K. Choi, and S. Emery, in The American Statistician, 67:3,171-182. The American Statistician, 68:2, 129-130. 

  • Dag, O., Asar, O., Ilk, O. (2014) A methodology to implement Box-Cox Transformation when no covariate is available. Communications in Statistics - Simulation and Computation, 43:7, 1740-1759. Available online at: http://www.tandfonline.com/eprint/hR232biVBry4P5XJGxZW/full
  • Asar, O., Ilk, O. (2013) mmm: an R package for analyzing multivariate longitudinal data with multivariate marginal models. Computer Methods and Programs in Biomedicine, 112:3, 649-654.
  • Yildiz G, Arslan-Ergul A, Bagislar S, Konu O, Yuzugullu H, et al. (2013) Genome-Wide Transcriptional Reorganization Associated with Senescence-to-Immortality Switch during Human Hepatocellular Carcinogenesis. PLoS ONE 8(5): e64016. doi:10.1371/journal.pone.0064016 
  • Rajabli, F., Inan, G., Ilk, O. (2013) Power analysis of C-TDT for small sample size genome-wide association studies by the joint use of case-parent trios and pairs. Computational and Mathematical Methods in M edicine (Special Issue: Statistical Analysis of Biomarkers for Personalized Med icine), vol. 2013, Article ID 235825, 7 pages, 2013. doi:10.1155/2013/235825. 
  • Ilk, H.G., Jane, O., Ilk, O. (2011) The effect of Laplacian filter in adaptive unsharp masking for infrared image enhancement. Infrared Physics & Technology, 54, 427-438. 
  • Ilk, O., Rajabli, F., Dungul, D., C., Ozdag, H., Ilk, H.G. (2011) A novel approach for small sample size family-based association studies: Sequential Tests. European Journal of Human Genetics, 19, 915-920. 
  • Cetinkaya M., Tulga-Oz F., Orhan A. I, Orhan K., Karabulut B., Can-Karabulut D.C., Ilk O. (2011) Prevalence of oral abnormalities in a Turkish newborn population. International Dental Journal, 61 (2), 90-100.
  • Karabulut, B., Tulga-Oz, F., Can-Karabulut, D.C., Batmaz, I., Ilk, O. (2009) Adhesion to Primary and Permanent Dentin and a Simple Model Approach, European Journal of Dentistry, 3, 32-41.
  • Ilk, O., Cinko, M., Akinc, D., Pekkurnaz, D. (2008) Hizmet Sektorunde Mali Basarisizligin Modellenmesi, Istatistik Arastirma Dergisi, 6,1, 52-64.
  • Ilk O. and Daniels M. (2007) Marginalized Transition Random Effects Models for Multivariate Longitudinal Binary Data. The Canadian Journal of Statistics - La revue canadienne de statistique, 35 (1), 105-123.
  • Ilk O. (2007) Use of Question and Comment Papers in College Teaching. Assessment Update, Vol 19, Number 6, pp. 12-13,16.
  • Adjengue L, Yacout S, Ilk O. (2007) Parameters Estimation for Condition Based Maintenance with Uncorrelated and Correlated Observations. Quality Engineering, 19, 197-206.
  • Erogul O., Ilk H. G., and Ilk O. (2001) A flexible bit rate switching method for low bit rate vocoders. Signal Processing, 81 (8), 1737-1742.

 

Recent Conference Proceedings/Papers
  • Dag, O., Ilk, O. (2015) MLE in a Feasible Region is as Good as or Better Than the Usual MLE While Estimating Box-Cox Transformation Parameter in ANOVA, The 8th Conference of EMR-IBS (Eastern Mediterranean Region of International Biometric Society), pp. 15, Cappadocia, Nevsehir, Turkey.
  • Cinar, O., Ilk, O., Iyigun C. (2014) A Survey Study of a Novel Approach for Clustering Genes With Dissimilar Replicates. The 8th Conference of EMR-IBS (Eastern Mediterranean Region of International Biometric Society), pp. 115, Cappadocia, Nevsehir, Turkey.
  • Iyigun C., Cinar, O., Ilk, O. (2014) Clustering of Time Course Gene Expression Data with Dissimilar Replicates. INFORMS Annual Meeting, San Francisco, CA, USA, November 9-12.
  • Dag, O., Asar, O., Ilk, O. (2013) Estimating Box-Cox Power Transformation Parameter Via Goodness-of-Fit Tests, y-BIS 2013: Joint Meeting of Young Business and Industrial Statisticians, pp. 66, 19-21 September, Istanbul, Turkey.
  • Inan, G., Ilk, O. (2013) A Marginalized Multilevel Model for Bivariate Longitudinal Binary Data, Complex Data Modelling and Computationally Intensive Statistical Methods for Estimation and Prediction, 9-11 September, Milan, Italy.
  • Dalkilic, S, Ozkeserli, Z, Ilk, O., Oguzulgen, I.K, Akar, N, Ozdag, H. (2013) High Resolution Transcriptomic Analysis of Trousseau Syndrome, XXIV Congress of the International Society on Thrombosis and Haemostasis, June 29 - July 4, Amsterdam, the Netherlands [e-poster].
  • Asar, O., Ilk, O. (2012) Multivariate marginal models for correlated data. 8th World Congress in Probability and Statistics, pp. 170, 9-14 July, Istanbul, Turkey.
  • Asar, O., Ilk, O. (2012) Analysis of multivariate longitudinal binary data: A forecasting study. 8th World Congress in Probability and Statistics, pp. 172, 9-14 July, Istanbul, Turkey
  • Dag, O., Asar, O., Ilk, O. (2012) A methodology to implement Box-Cox transformation when no covariate is available. 8th World Congress in Probability and Statistics, pp. 188, 9-14 July, Istanbul, Turkey.
  • Inan, G., Ilk, O., Daniels, M. (2012) A likelihood-based multilevel model for longitudinal bivariate binary data. 8th World Congress in Probability and Statistics, pp. 248, 9-14 July, Istanbul, Turkey.
  • Bacanli, G., Koksal, G., Ilk, O. (2012) Design Optimization with a Categorical Response. INFORMS Annual Meeting, October 2012, Phoenix, Arizona, USA.
  • Cinar, O., Ilk, O., Iyigun, C. (2012) Biclustering on Microarray Gene Expression Data. ECCO 2012, 25th Conference of European Chapter on Combinatorial Optimization, April 2012, Antalya. 




Scholarships & Awards & Honers: 
  • Academic performance award from METU - Ranked among the top 20% within the faculty of Arts and Science for the activities during the last three years (2008 & 2010 & 2014)
  • Teaching recognition - Ranked among the top 20% within the faculty of Arts and Science in student evaluations (2005 & 2007 & 2008 & 2009 & 2011 & 2012 & 2013)
  • Best y-BIS Paper Award - Dag, O., Asar, O., Ilk, O. - Estimating Box-Cox Power Transformation Parameter Via Goodness-of-Fit Tests. y-BIS 2013: Joint Meeting of Young Business and Industrial Statisticians in Istanbul, Turkey (2013).
  • Research grant from TUBITAK for a COST (European Cooperation in Science and Technology) project - Co-investigator in a research project directed by Assoc. Prof. Hilal Ozdag (Ankara University, Biotechnology Institute) (2013-)
  • Co-author of a study that received the 3rd place among oral presentations- Dungul DC, Belder N, Rajabli F, Inan G, Savas B, Ensari A, Kuzu A, Gecim E, Ilk O, Ilk HG, Ozdag H. (2011) Aile Temelli Genom Boyu Asosiyasyon Calismasi ile Sporadik Kolorektal Kanserde Yeni Yatkinlik Genlerinin Tanimlanmasi, XII. Ulusal Tibbi Biyoloji ve Genetik Kongresi, Turkiye Klinikleri Tip Bilimleri Dergisi, pp. 35.
  • Research grant from TUBITAK - Co-investigator in a research project directed by Assoc. Prof. Hilal Ozdag (Ankara University, Biotechnology Institute) (2008-2011)
  • Partial travel grant from TUBITAK - To attend ISTKON5 conference in Antalya, Turkey (2007) 
  • Research grant from TUBITAK - Co-investigator, together with Assist. Prof. Ozlen Konu, in a research project directed by Assoc. Prof. Isik Yulug (Bilkent, Dept. of Molecular Biology and Genetics) (2007 & 2008)
  • Research grant from TUBITAK - Co-investigator, together with Assoc. Prof. Isik Yulug, in a research project directed by Assist. Prof. Ozlen Konu (Bilkent, Dept. of Molecular Biology and Genetics) (2007 & 2008)
  • Research grant from TUBITAK (The Scientific and Technological Research Council of Turkey) - Principle investigator of a research project, 36,564 YTL (~ 19,000 Euro) (2006) 
  • Research grant from METU - new faculty start-up grant, 5,000 YTL (~ 2,600 Euro) (2005) 
  • Travel grant from European Union - To attend European young statisticians training camp to the 25th European Meeting of Statisticians and 25th European Meeting of Statisticians (the only recipient from Turkey) (2005) 
  • Scholarship from Turkish Higher Educational Council and METU for M.S. and Ph.D. studies at ISU (1998-2003) 
  • Graduated in 3.5 years as a High Honor Student from METU (1997), ranked 2nd in a class of 117.