Comparing groups with respect to hypothetical constructs requires that the measurement models are equal across groups. Otherwise conclusions drawn from the observed indicators regarding differences at the latent level (mean differences, differences in the structural relations) might be severly...

Web surveys technically allow providing feedback to respondents based on their previous responses. This personalized feedback may not only be used to target follow-up questions, it also allows test results to be returned immediately to respondents. This paper argues that the possibility of...

Researchers and policy makers face significant challenges in selecting a method to conduct remote surveys, especially when collecting sensitive information or during turbulent life stages of hard-to-reach groups. In the context of the COVID-19 lockdown, we randomly selected about 600 adults in...