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Photo of Zejnullahi, Rrita

Rrita Zejnullahi

Clinical Assistant Professor

Epidemiology and Biostatistics


Building & Room:



1603 W Taylor St.

Office Phone:



I am a Statistician and a Clinical Assistant Professor of Biostatistics with appointments in the School of Public Health, Division of Epidemiology and Biostatistics (primary), and the College of Applied Health Sciences (joint). My research interests are in the quantification of uncertainty of point estimates from predictive models, the formulation of effect sizes and effect size estimators in randomized and quasi-experiments when adjusting for covariates, and extensions of meta-analysis methods to small sample situations.

Selected Publications

Zejnullahi, R., Hedges, L.V. (2023). Robust variance estimation in small meta-analysis with the standardized mean difference. Research Synthesis Methods. 1-17.

Hedges, L.V., Tipton, E., Zejnullahi, R., Diaz, K.G. (2023). Effect sizes in ANCOVA and difference-in-differences designs. British Journal of Mathematical and Statistical Psychology, 76 (2), 259-282.

[Corresponding Author]


Ph.D., Statistics, Northwestern University, 2021