Kolbe, L., Molenaar, D., Jak, S., & Jorgensen, T. D. (in press). Assessing measurement invariance with moderated nonlinear factor analysis using the R package OpenMx. Psychological Methods. Preprint

van Alphen, T., Jak, S., Jansen in de Wal, J., Schuitema, J. & Peetsma, T.D. (2022). Determining reliability of daily measures: An illustration with data on teacher stress. Applied Measurement in Education. Article Postprint, data and script

Stolwijk, I.J., Jak, S., Eichelsheim, V.I., & Hoeve, M. (2022). Dealing with Dependent Effect Sizes in MASEM: A comparison of different approaches using empirical data. Zeitschrift fur Psychologie : Journal of Psychology. Article Postprint, data and script


Kolbe, L., Oort, F.J. & Jak, S. (2021). Bivariate distributions underlying responses to ordinal variables. Psych, 3(4), 562-578. Article

Jak, S., Li, H., Kolbe, L., de Jonge, H., & Cheung, M.W.-L. (2021). Meta-analytic structural equation modeling made easy: A tutorial and web application for one-stage MASEM. Research Synthesis Methods, 12, 590-606. Article webMASEM app Data and scripts

Jak, S., Jorgensen, T.D., & Rosseel, Y. (2021). Evaluating cluster-level factor models with lavaan and Mplus. Psych, 3(2), 134-152. Article Data and scripts Also see the comment of Asparahouv and Muthen on this article.

Jansen, D., Elffers, L. & Jak, S. (2021). A cross-national exploration of shadow education use by high and low SES families. International Studies in Sociology of Education. Article

Thijssen, L., van Tubergen, F., Coenders, M., Hellpap, R., & Jak, S. (2021). Discrimination of black and muslim minority groups in western societies: Evidence from a meta-analysis of field experiments. International Migration Review. Online first. Article


Jak, S., Jorgensen, T.D., Verdam, M.G.E., Oort, F.J. & Elffers, L. (2020). Analytical power calculations for structural equation modeling: A tutorial and shiny app. Behavior Research Methods, 54, 1385-1406. Link power4SEM app

Jak, S. & Cheung, M.W.-L. (2020) Meta-analytic structural equation modeling with moderating effects on SEM parameters. Psychological Methods, 25(4), 430-455. Link Link Supplementary materials

Jorgensen, T. D., & Jak, S. (2020). Review of Gana & Broc's Structural Equation Modeling with lavaan. Psychometrika. Link

Jak, S. & Cheung, M.W.-L. (2020) A commentary on Lv and Maeda (2019). Structural Equation Modeling, 27, 438-441. Link

de Jonge, H., Jak, S., & Kan, K.J. (2020). Dealing with artficially dichotomized variables in meta-analytic structural equation modeling. Zeitschrift fur Psychologie/Journal of Psychology, 228, 25-35.


Jansen, R. S., Van Leeuwen, A., Janssen, J., Jak, S. & Kester, L. (2019). Self-regulated learning partially mediates the effect of self-regulated learning interventions on achievement in higher education: a meta-Analysis. Educational Research Review. doi:10.1016/j.edurev.2019.100292

Jak, S. (2019). Cross-level invariance in multilevel factor models. Structural Equation Modeling, 26, 607-622. Link

Melnyk, V., van Herpen, E., Jak, S. & van Trijp, H. (2019). The mechanisms of social norms influence on consumer decision making. Zeitschrift fur Psychologie/Journal of Psychology, 227, 4-17.

Eltanamly, H., Leijten, P.H.O., Jak, S., & Overbeek, G.J. (2019). Parenting in times of war: A meta-analysis and qualitative synthesis of war-exposure, parenting, and child adjustment. Trauma, Violence, & Abuse.


Jak, S. & Cheung, M.W.-L. (2018). Accounting for missing correlation coefficients in fixed-effects meta-analytic structural equation modeling. Multivariate Behavioral Research, 53(1), 1-14. Link

Jak, S. & Cheung, M.W.-L. (2018). Testing moderator hypotheses in meta-analytic structural equation modeling using subgroup analysis. Behavior Research Methods, 50(4), 1359-1373. Link


Jak, S. & Jorgensen, T.D. (2017). Relating measurement invariance, cross-level invariance, and multilevel reliability. Frontiers in Psychology, 8, 1640. Link

Jak, S. (2017). Book review: MW-L CHEUNG. Meta-analysis: A Structural Equation Modeling Approach. New York: Wiley. Biometrics, 73, 357-358.

Roorda, D.L., Jak, S., Zee, M., Oort, F.J. & Koomen, H.M.Y. (2017). Teacher-student relationships and studentsí achievement: Using a meta-analytic approach to test the mediating role of school engagement. School Psychology Review, 46(3), 239-261.

Jak, S. (2017). Testing and explaining differences in common and residual factors across many countries. Journal of Cross-Cultural Psychology, 48(1), 75-92.


Cheung, M.W.-L & Jak, S. (2016). Analyzing big data in psychology: A Split/Analyze/Meta-Analyze Approach. Frontiers in Psychology, 7, 738.

Oort, F.J. & Jak, S. (2016). Maximum likelihood estimation in meta-analytic structural equation modeling. Research Synthesis Methods, 7, 156-167.

Noordstar, J.J., van der Net, J. Jak, S., Helders, P.J.M. & Jongmans, M.J. (2016). Global self-esteem, perceived athletic competence, and physical activity in children: A longitudinal cohort study. Psychology of Sport & Exercise, 22, 83-90.

Noordstar, J.J., van der Net, J. Jak, S., Helders, P.J.M. & Jongmans, M.J (2016). The change in perceived motor competence and motor task values during elementary school: Gender and motor performance differences. British Journal of Developmental Psychology, 34, 427-446. DOI: 10.1111/bjdp.12142.


Jak, S. (2015). Meta-analytic structural equation modeling . Springer International Publishing.

Jak, S. & Oort, F.J. (2015). On the power of the test for cluster bias. British Journal of Mathematical and Statistical Psychology, 68, 434-455.

Delforterie, M.J., Creemers, H.E., Agrawal, A., Lynskey, M.T., Jak, S., van der Ende, J., Verhulst, F.C., & Huizink, A.C. (2015). Functioning of cannabis abuse and dependence criteria across two different countries: the United States and the Netherlands. Substance use and misuse, 50, 242-250.

Delforterie, M.J., Creemers, H.E., Agrawal, A., Lynskey, M.T., Jak, S., & Huizink, A C. (2015). The influence of age and gender on the likelihood of endorsing cannabis abuse/dependence criteria. Addictive behaviors, 42, 172-175.


Jak, S., Oort, F.J. & Dolan, C.V. (2014). Using two-level factor analysis to test for cluster bias in ordinal data. Multivariate Behavioral Research, 49, 544-553.

Jak, S. (2014). Testing strong factorial invariance using three-level structural equation modeling. Frontiers in Psychology, 5, 745. DOI: 10.3389/fpsyg.2014.00745.

Jak, S., Oort, F.J. & Dolan, C.V. (2014). Measurement bias in multilevel data. Structural Equation Modeling, 21, 31-39.

Hoeve, M., Jak, S., Stams, G.J. & Meeus, W.H.J. (2014). Financial problems and delinquency in adolescents and young adults: A six-year three-wave study. Crime & Delinquency. DOI: 0011128714541190.


Jak, S., Oort, F.J. & Dolan, C.V. (2013). A test for cluster bias: Detecting violations of measurement invariance across clusters in multilevel data. Structural Equation Modeling, 20, 265-282.

Jak, S., Oort, F.J., Roorda, D.L., & Koomen, H.M.Y. (2013). Meta-analytic structural equation modeling with missing correlations. Netherlands Journal of Psychology, 67, 132-139.

Barendse, M.T., Oort, F.J., Jak, S. & Timmerman, M.E. (2013). Multilevel exploratory factor analysis of discrete data. Netherlands Journal of Psychology, 67, 114-121.

Merz, E.M. & Jak, S. (2013). The long reach of childhood: Social relationships across the life course. Advances in Life Course Research, 18, 212-222.


Jak, S., Zand Scholten, A. & Oort, F.J. (2012). Preface: Non-standard structural equation modeling. Netherlands Journal of Psychology, 67, 46-47.

Spilt, J., Koomen, H.M.Y & Jak, S. (2012). Are boys better off with male and girls with female teachers? A multilevel investigation of measurement invariance and gender match in teacher-student relationship quality. Journal of School Psychology, 50, 363-378.

Koomen , H.M.Y, Verschueren, K., van Schooten, E., Jak, S. & Pianta, R. C. (2012). Validating the Student-Teacher Relationship Scale: Testing factor structure and measurement invariance across child gender and age in a Dutch sample. Journal of School Psychology, 50, 215-234.

Griffioen, D., de Jong, U. & Jak, S. (2012). Research self-efficacy of lecturers in non-university higher education. Innovation in Education and Teaching International, 50, 25-37.


Jak, S., Oort, F.J. & Dolan, C.V. (2010). Measurement bias and multidimensionality; an illustration of bias detection in multidimensional measurement models. Advances in Statistical Analysis, 94, 129-137.

Jak, S. & Evers, A.V.A.M. (2010). Een vernieuwd meetinstrument voor organizational commitment. Gedrag en Organisatie, 23, 158-171.