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. She is co-founder of the Psychometric Lab in the Department of Statistics (https://psychometricslab.com/). She received an honorary doctorate from the Faculty of Social Sciences at the University of Uppsala in 2014, she was editor-in-chief of the journal Psychometrika (2014-2018) and President of the Psychometric Society (2022-2023).