This article calls into question the view that educational expansion has a causal effect on class-based inequalities of educational opportunity. This view, the impetus for many studies, is flawed because the empirical literature is hampered by poor measures of expansion and because it rests on simplistic understandings of the causal structure that…

In analyzing data from attitude surveys, it is common to consider the "don't know" responses as missing values. In this article, we present a statistical model commonly used for the analysis of responses/evaluations expressed on Likert scales and extended to take into account the presence of don't know responses. The main objective is to…

Extending the discussion on replication in sociology and psychology, this article focuses on the adaption of scales in research. Drawing on a recently published scale, we highlight several validity issues in the scale's composition and development. Using data from two empirical studies, we subsequently show how scales can be tested and adapted. In…