Gemechis Djira

Education

PhD, Biostatistics, Leibniz University Hannover
MS, Biostatistics, Limburgs Universitair Centrum
MS, Applied Statistics, Limburgs Universitair Centrum
MS, Statistics, Addis Ababa University
BS, Statistics, Addis Ababa University

Academic Responsibilities

Teaching:
. Biostatistics I & II (HSC 631 & 731) for Health Science Students
. Biostatistics (STAT 731) for Statistics and Mathematics majors
. Regression Analysis I (STAT 686)
. Statistical Consulting
. Statistical Methods II (STAT 541)
. SAS Programming (STAT 4/510)
Advising MS & PhD students.

Committee Activities

Assessment Academy (2019 - 2021)
Student Success (2020-2022)
SDSU Data Science Symposium organizing committee (2023-)

Grants

. Grant from USDA (2014-2017), Role: Co-PI. Title: Providing Opportunities for Increased Minority High School Students Enrollment into University Agricultural Sciences, Mathematics, and Engineering Programs. PI: T. Nleya, SDSU, Plant Science Department. WAMS-NIFA. $150,000.

. Research Experience for Undergraduates (REU) - NSF (1/2012 - 12/2014). The Simulation and Analysis REU at South Dakota State University had four parts and one of which was Statistics. Role: Primary faculty mentor for the statistics part. Advised 2-3 undergraduate students and a graduate student every summer. PI: J. Kimn, Mathematics and Statistics Department, SDSU.

. Two grants from the U.S. Department of Labor – Occupational Safety and Health Administration (OSHA), Grant #: SA0900085. Role: Statistical consultant and advising graduate and undergraduate students. Co-PIs: James Manning (Program Director, OSHA, SD), Jon Puetz (Senior Safety & Health Consultant, SHARP coordinator, SD), Kevin Dalsted (Director, Engineering Resource Center, SDSU). National OSHA data were analyzed and reported on two occasions (FY 2009 & 2010) to assess the effectiveness of the OSHA Safety and Health Achievement Recognition Program (SHARP) over time. Federal Share: $110,141.00.

Professional Memberships

International Biometric Society, ENAR: Eastern North American Region (2005 - Present)

Work Experience

Professor, South Dakota State University (5/2023 - Present)
Co-director of Statistical Consulting Service at SDSU (9/2021 - Present)
Director of Statistical Consulting Service at SDSU (2015 - 8/2021)
Associate Professor of Biostatistics, South Dakota State University (8/2013 - 5/2023)
Assistant Professor of Biostatistics, South Dakota State University (8/2007 - 7/2013)
Research Assistant, Institute of Biostatistics, University of Hannover (10/2002 - 7/2007)
Lecturer, Department of Statistics, Addis Ababa University (9/1990 - 8/2000)

Creative Activities

Publications:
* R statistical software add on package: Djira, G.D., Hasler, M., Gerhard, D., Segbehoe, L., and Schaarschmidt, F. (2020). mratios: Inferences for ratios of coefficients in the general linear model. R package version 1.4.2. http://CRAN.R-project.org/package=mratios. This is an on-going project since 2006.

* Book Chapters: In - Modeling Dose-response Microarray Data in Early Drug Development Experiments Using R. Edited by Lin, D.; Shkedy, Z.; Yekutieli, D.; Amaratunga, D.; Bijnens, L. Springer.
. Lin, D., Hothorn, L.A., Djira, G.D., and Bretz, F. (2012). Multiple contrast tests for testing dose–response relationships under order-restricted alternatives. Chapter 15, pp233–248.
. Lin, D., Djira, G.D., Shkedy, Z., Burzykowski, T., and Hothorn, L.A. (2012). Simultaneous inferences for ratio parameters using multiple contrasts tests. Chapter 16, pp249–258.
. Lin, D., Yekutieli, D., Djira, G.D., and Hothorn, L.A. (2012). Multiple confidence intervals for selected ratio parameters adjusted for the false coverage-statement rate. Chapter 16, pp259–267.

* Sample Peer-reviewed Publications:
. Dilba, G., Bretz, F., Guiard, V. (2006). Simultaneous confidence sets and confidence intervals for multiple ratios. Journal of Statistical Planning and Inference 136, 2640–2658.
. Dilba, G., Bretz, F., Hothorn, L.A., Guiard, V. (2006). Power and sample size computations in simultaneous tests for non-inferiority based on relative margins. Statistics in Medicine 25, 1131–1147.
. Djira, G.D. (2010). Relative potency estimation in parallel-line assays – Method comparison and some extensions. Communications in Statistics – Theory and Methods 39, 1180 1189.
. Padhy, B., Emo, K., Djira, G., and Deokar, A. (2015). Analyzing Factors Influencing Teaching as a Career Choice using Structural Equation Modeling. SAGE Open. DOI: 10.1177/2158244015570393.
. Segbehoe, L.S., Schaarschmidt, F., and Djira, G.D. (2022). Simultaneous confidence intervals for contrasts of quantiles. Biometrical Journal 64 (1), 7-19.
. Bulty, B.G., Gotu, B., and Djira, G. (2023). A spatial panel autoregressive model specification with inverse quantile separation distances of locations. Spatial Statistics (57). https://doi.org/10.1016/j.spasta.2023.100771.