Conference contributions
Partchev, I., Zwitser, R.J., Van der Palm, D., Bechger, T.M., & Maris, G.K.J. (2017). Introducing dexter: An R Package for Managing and Analysing Test Data. Presentation at the International Workshop on Psychometric Computing, 9-10 February 2017, Wien, Austria.

Zwitser, R.J. &  Maris, G. (2016). Differential Item Function in educational surveys. It’s there and it should be there! Presentation at the VII European Congress of Methodology, 27-29 July 2016, Palma de Mallorca, Spain. [pdf]

Zwitser, R.J., Glaser, S.S.F. & Maris, G. (2014). Monitoring Countries in a Changing World. A New Look at DIF in International Surveys. Presentation at the RCEC workshop, 20-21 November 2014, Enschede, The Netherlands. [pdf]

Zwitser, R.J. & Maris, G. (2013). Ordering Individuals with Sum Scores: the Introduction of the Nonparametric Rasch Model. Presentation at the International Meeting of the Psychometric Society (IMPS), 22-26 July 2013, Arnhem, The Netherlands. [pdf]

Zwitser, R.J. (2012). Reliability of Aggregation of Results on Multiple Assessments: Which Role can Retests Play? Round table presentation at the American Educational Research Association (AERA) conference, 13-17 April 2012, Vancouver. [pdf]

Zwitser, R., Béguin, A., & Maris, G. (2011). Complex Decision Rules and Misclassification: Who Should Take a Retest? Presentation at the International Meeting of the Psychometric Society (IMPS), 18-22 July 2011, Hong Kong. [pdf]

Zwitser, R. & Béguin, A. (2011). Over het nut van herkansen [On the usefulness of resits]. Presentation at the Onderwijs Research Dagen [Dutch Educational Research Days], 8-10 June 2011, Maastricht, The Netherlands. [pdf]

Zwitser, R.J. & Maris, G. (2010). CML Estimation in Multistage Testing. Poster presentation at the International Association for Computerized Adaptive Testing (IACAT) conference, 7-9 June 2010, Arnhem, The Netherlands. [pdf]

Invited talks
Zwitser, R.J.  (2015). Scoring surveys with DIF: an index-based approach. Presentation at the Cito symposium “Comparing Apples with Apples”, 23 April 2015, Arnhem, The Netherlands. [pdf]

Zwitser, R.J. (2012). Als ik u zeg dat u zeer mild of streng beoordeelt, past u uw gedrag dan aan? [If I tell you that your judgements are lenient or severe, do you then adjust your rating behavior?] Invited speech at the 20th Anniversary Conference of the State Exams for Dutch as Second Language, 31 August 2012, Amsterdam, The Netherlands. [pdf]

Zwitser, R.J. (2011). Een internationale vergelijking van wiskundekennis in het voortgezet onderwijs met PISA [An international comparison of math performance in secondary education with PISA]. Invited speech at the Annual Meeting of the Netherlands Society for Statistics and Operations Research, 3 March 2011, Utrecht, The Netherlands. [pdf]