Brown Bag Seminar: Saskia Van Laar

Title: Random responders in international large-scale assessments in education: a Threat to validity.

Abstract: Low-stakes assessments are assumed to be susceptible to different types of invalid response behavior, whereby responses no longer reflect one’s knowledge, abilities or opinions related to test content. This causes problems as the use and interpretation of test results are dependent on the validity of the responses. We will focus on random responding, a specific type of invalid response behavior for which it is expected that items are answered without any attention to their content, resulting in random uncorrelated response patterns across items. By means of different mixture models we will identify those individuals who qualify as random responders based on their response pattern. Subsequently, we will show some examples in the TIMSS 2015 student questionnaire of the prevalence of random responders, as well as the impact these random responders can have on test results. Potential avenues for further work will be discussed.


The Brown Bag seminars are given via Zoom and require registration. To register, please visit::


Published Nov. 16, 2020 2:18 PM - Last modified Nov. 16, 2020 2:18 PM