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About us Faculty of Behavioural and Social Sciences Psychology Research Units Psychometrics and statistics

Norming Methods for Psychological Tests

Clinical and Developmental Neuropsychology, Psychometrics and Statistics

At present, norms for intelligence and developmental (IDe) tests are estimated using so‐called continuous norming, rather than norming per subgroup. Continuous norming is generally believed to be more efficient than the traditional norming per subgroup. The core idea of continuous norming is to build a statistical model that relates the relevant characteristics (as age) to the distribution of test scores. Various statistical (continuous) norming methods exist, but the quality of the procedures has been hardly examined, and the procedures have not been mutually compared. In addition, there are no well founded procedures to compute a minimally required sample size for a norm group, only rules of thumb are available. The aims of this project are (1) to identify the optimally suitable and most efficient continuous norming approach for IDe tests, and (2) to develop methodology to optimize the sampling design for this approach. The methodology will be applied in computing the norms for various intellegence (a.o. German and Dutch IDS-2; SON-R) and neuropsychological tests (a.o. FEEST).

Researchers and partners

Behavioural and Social Sciences, Psychology
Partners outside of the University of Groningen
  • dr. S. Ruiter, de Kinderacademie
  • dr. P. Tellegen, SON Test research


Successful grant proposals and other achievements
  • Provided the norming for the FEEST (Facial Expressions of Emotion - Stimuli and Tests) and the SON-R 2-8 (to be published in 2016/2017).
Last modified:29 March 2021 10.18 a.m.
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