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Research
Since January 2009 I am a very happy PhD student at the department of educational sciences. My research project is about the detection of measurement bias in multilevel data. Currently I am working on a procedure to test measurement bias with respect to level 1 variables, level 2 variables and the clustering variable, using structural equation modeling. My supervisors are prof. dr. F.J. Oort and dr. C.V. Dolan.
My telephone number is actually 020-5251557, not the one above.
Education
- 2002 - 2007, Organizational Psychology, University of Amsterdam
- 2007 - 2008, Psychological Methods, University of Amsterdam
Teaching
- 2008, tutorials 'Basic research skills', Department of Psychology, University of Amsterdam.
- 2009, reading group 'Structural Equation Modeling', Department of Educational Sciences, University of Amsterdam.
- 2009 - 2012, teaching assistant 'Structural Equation Modeling', Department of Educational Sciences, University of Amsterdam.
Papers
Jak, S., Oort, F.J. & Dolan, C.V. (in press). A test for cluster bias: Detecting violations of measurement invariance across clusters in multilevel data. Structural Equation Modeling.
Jak, S., Oort, F.J. & Dolan, C.V. (in press). Measurement bias in multilevel data. Structural Equation Modeling.
Koomen , H.M.Y, Verschueren, K., van Schooten, E. Jak, S. & Pianta, R. C. (in press). 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.Spilt, J., Koomen, H.M.Y & Jak, S. (in press). 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.
Jak, S., Oort, F.J. & Dolan, C.V. (2010). Measurement bias and multidimensionality; an illustration of bias detection in multidimensonal measurement models. Advances in Statistical Analysis, 94, 129 - 137.
http://www.springerlink.com/content/n07273u80873g111/
Jak, S. & Evers, A.V.A.M. (2010). Een vernieuwd meetinstrument voor organizational commitment. Gedrag en Organisatie, 23, 158 - 171. dare.uva.nl/record/370740