Till umu.se


Research interests and projects:

Theory and method: Psychometrics, Test equating.  Functional data analysis in psychometrics,  and International large-scale achievement studies.

Fields of application: Educational measurement, Behavioral sciences, International achievement assessments.


Editorial boards, academy membership and awards

  • Associate editor for Journal of Educational Measurement (2015-2016) and on the editorial board for the International Journal of Testing
  • Coordinating editor of Behaviormetrika
  • Co-editor of the proceedings of the annual meeting of the Psychometric Society.
  • Active member of the young academy of Sweden (until 2018).
  • Young researcher  career Award 2008
  • Royal Skyttean prize for young researchers


  • Spring semester 2017: Basic Statistics

PhD students

  • Gabriel Wallin
  • Co-supervisor for Jannika Lindvall

Completed PhD students:

  • Jonathan Wedman (PhD, 2017: Theory and validity evidence for a large-scale test for selection to higher education)
  • Inga Laukityte (PhD, 2017: Statistical Modeling in International Large-scale Assessments)
  • Kenny Bränberg (PhD, 2010: Observed score equating with covariates)
  • Co-supervisor: Valentina Sansivieri (PhD 2017: Item response theory equating with the non-equivalent groups with covariates design)
  • Co-supervisor: Björn Andersson (PhD, 2014: Contributions to Kernel equating)
  • Co-supervisor: Jenny Häggström (PhD, 2011: Selection of smoothing parameters with application in causal inference)
  • Co-supervisor: Anna Sundström (PhD, 2009: Developing and validating self-report instruments)
  • Co-supervisor: Per-Erik Lyrén (PhD, 2009: A perfect score: Validity arguments for college admission tests)

Selected recent publications:


Gonzalez, J. & Wiberg, M. (2017). Applying test equating methods – using R. Springer.

Laukaityte, I. & Wiberg, M. (2017). Using plausible values in secondary analysis in large–scale assessments. Communication in Statistics – Theory and Methods. In press.

Wiberg, M. & von Davier, A. A. (2017). Examining the impact of covariates on anchor tests to ascertain quality over time in a college admissions test. International Journal of Testing. 17, 105-126.

Ramsay, J. O. & Wiberg, M. (2016). A [0,n] Test Theory to Replace Sum Scoring. Journal of Educational and Behavioral Statistics, In press.

Andersson, B. & Wiberg, M. (2016). Item response theory observed-score kernel equating. Psychometrika. doi:10.1007/s11336-016-9528-7.

Gonzalez, J. Wiberg, M., & von Davier, A. (2016). A note on the Poisson’s binomial distribution in item response theory. Applied Psychological Measurement. 40(4), 302-310.

Wiberg, M. & Gonzalez, J. (2016). Statistical assessment of estimated transformations in observed-score equating, Journal of Educational Measurement, 53(1), 106-125.

Wiberg, M. (2016). Alternative linear IRT observed-score equating methods. Applied Psychological Measurement, 40(3), 180-199.

Wiberg, M. & Bränberg, K. (2015). Kernel equating under the non-equivalent groups with covariates design. Applied Psychological Measurement, 39(5), 349-361.

Häggström, J. & Wiberg, M. (2014). Optimal bandwidth in observed-score kernel equating. Journal of Educational Measurement, 51(2), 201-211.

Wiberg, M., van der Linden, W.J., & von Davier, A. (2014). Local kernel observed-score equating. Journal of Educational Measurement, 51(1), 57-74.

Andersson, B., Bränberg, K. & Wiberg, M. (2013). Performing the kernel method of test equating using the package kequate. Journal of Statistical Software, 55, 1-25.

Wiberg, M. (2012). Can a multidimensional test be evaluated with unidimensional item response theory? Educational Research and Evaluation, 18(4), 307-320.

Bränberg, K. & Wiberg, M. (2011). Observed score linear equating with covariates. Journal of Educational Measurement, 48(4), 419-440.

Wiberg, M. & van der Linden, W. J. (2011). Linear local observed-score equating. Journal of Educational Measurement, 48(3), 229-254.

Selected Applications

Wiberg, M. & Rolfsman, E. (2013). School effectiveness in Science in Sweden and Norway viewed from a TIMSS perspective. Utbildning och Demokrati, 22(3), 69-84.

Adolfsson, L., Benckert, S., & Wiberg, M. (2011). Gapet har minskat: skillnader mellan hög och lågpresterande flickors och pojkars attityder till biologi, fysik och kemi 1995 och 2007. NorDiNa (Nordic Studies in Science Education), 7(1), 3-16.

Carelli, G. Wiberg, B. & Wiberg, M. (2011). Development and construct validation of the Swedish Zimbardo Time Perspective Inventory (S-ZTPI). European Journal of Psychological Assessment, 27(4), 220-227.

Wiberg, M. (2009). Teaching statistics in integration with psychology. Journal of Statistics Education. 17(1), Available at http://www.amstat.org/publications/jse/v17n1/wiberg.html.

Brief CV

Currently: Professor at the Department of Statistics, USBE, Umeå University.
2015- : Professor of Statistics with specialty in Psychometrics, USBE; Umeå University, Sweden.
2010-2015: Associate Professor at the Dept. of Statistics, USBE; Umeå University, Sweden.
2006-2010: Assistant Professor at the Dept. of Statistics, Umeå University, Sweden.
2006 (spring): Post doc at University of Twente, the Netherlands.
2005 (fall): Visiting scholar at McGill University, Canada
2004-2005: Lecturer at Dept. of Statistics, Umeå University, Sweden.
2003: PhD in Statistics, Umeå University, Sweden.




Infört sorteringsordning

Rolfsman, Ewa

Vad kan vi lära av storskaliga internationella komparativa kunskapsmätningar för att utveckla den svenska skolan?


Wiberg, Marie

Nya statistiska metoder för standardiserade kunskapsprov


Wiberg, Marie

Att mäta svenska elevers prestationer i internationella kunskapsprov


Wiberg, Marie

Metodutveckling för analys och utvärdering av datorbaserade kunskapsprov





År sorteringsordning


Wallin, Gabriel
Wiberg, Marie

Nonequivalent groups with covariates design using propensity scores for kernel equating
Quantitative Psychology: 309-319



Sansivieri, Valentina
Wiberg, Marie

IRT observed-score equating with the non-equivalent groups with covariates design
Quantitative Psychology: 275-285



Wiberg, Marie
von Davier, Alina A.

Examining the Impact of Covariates on Anchor Tests to Ascertain Quality Over Time in a College Admissions Test
International Journal of Testing, 17(2): 105-126



Ramsay, James O.
Wiberg, Marie

Breaking through the sum scoring barrier
Quantitative Psychology: 151-158



L. van der Ark, Andries
Wiberg, Marie
Culpepper, Steven A.; et al.

Quantitative psychology. The 81st annual meeting of the Psychometric society, Asheville, North Carolina, 2016



Wiberg, Marie

Ensuring test quality over time by monitoring the equating transformations
Quantitative Psychology: 239-251



Wiberg, Britt
Sircova, Anna
Wiberg, Marie; et al.

Balanced time perspective: developing empirical profile and exploring its stability over time



Laukaityte, Inga
Wiberg, Marie

Using plausible values in secondary analysis in large–scale assessments
Communications in Statistics - Theory and Methods, 46(22): 11341-11357



Andersson, Björn
Wiberg, Marie

Item response theory observed-score kernel equating
Psychometrika, 82(1): 48-66



Laukaityte, Inga
Wiberg, Marie

The importance of sampling weights in multilevel modeling of international large-scale assessment data
Communications in Statistics - Theory and Methods



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