Dr Alexandru Cernat


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Alexandru Cernat joined Social Statistics in July 2016. Prior to this he was a Research Associate at the National Centre for Research Methods.


Reseach interests

An important part of his research is centred around modelling measurement error in the framework of generalized latent variables (i.e., Structural Equation Modelling, Latent Class and Item Response Theory) with a particular interest in applying these to longitudinal data.

These statistical models are often used in the context of survey methodology to investigate topics such as: measurement error, non-response, mixed mode designs, longitudinal surveys, paradata, interviewer effects, surveying sensitive topics, etc.

Another research area of interest is missing data and ways to correct for this. This work focuses especially on missing biomarkers in surveys and is part of the National Centre for Research Methods grant: Acounting for informative item nonresponse in biomarkers collected in longitudinal surveys (WP3).


Reseach team

We have a thriving group working on survey research and data quality. Current members of the team include:

  • Fiona Pashazadeh: Addressing non-response in biological data collection using nurse effects and survey paradata.
  • Hafsteinn Birgir Einarsson: Improving response rates and data quality through optimised survey invitation letters.
  • Sofia Eleftheriadou: Collaboration problem solving and science teaching and learning.
  • Zeming Chen: Using proactive approaches in preventing web survey break-offs.
  • Raul Ungureanu: Understanding comparisons between surveys and social media data.


  • PhD in Survey Methodology (University of Essex)
  • MSc in Social Policy Analysis (KU Leuven)
  • BA in Sociology (University of Bucharest)

Areas of expertise

  • HA Statistics - Structural Equation Modeling, Latent Class Analysis, Longitudinal Data Analysis, Multilevel modeling, Multiple Imputation, Weighting, Survey Design, Mixed Mode Surveys, Longitudinal Data Design


  • survey methodology, latent variable modeling, longitudinal data

Related information


Research output: Contribution to journalArticlepeer-review

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Activity: Publication peer-review and editorial workPublication peer-review

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Prize: Fellowship awarded competitively

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