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...

In recent years, political and social scientists have made increasing use of conjoint survey designs to study decision-making. Here, we study a consequential question which researchers confront when implementing conjoint designs: how many choice tasks can respondents perform before survey...