Irini’s work is on the development of statistical methodology for analysing large and complex data sets. Her research interests and methodological contributions are in latent variable modelling for categorical and mixed outcomes, structural equation modelling, estimation methods, goodness-of-fit testing, detection of outliers and treatment of missing values and drop out in longitudinal studies. Her areas of application are in social sciences, education, psychiatry and health.

She completed her PhD in 1996 in the Department of Statistics at the LSE.  She has co-authored books on latent variable models and multivariate data analysis and served as an associate editor and editorial member for a number of scientific journals. She received an honorary doctorate from the Faculty of Social Sciences at the University of Uppsala in 2014 and she is the current editor-in-chief of the journal Psychometrika (2014-2018).