“…Although the cross-national comparability of these scales has received considerable methodological attention (Heath, Martin, & Spreckelsen, 2009;Medina, Smith, & Long, 2009;Reeskens & Hooghe, 2010), no study, to our knowledge, has so far examined whether they can be validly compared or pooled in countries with distinct subnational groups. Although some common causes of nonequivalence are less likely to be problematic within a country (e.g., data collection and sampling methods; Heath et al, 2009), distinctive features of the subnational groups, in particular different languages (Davidov & De Beuckelaer, 2010), may jeopardize measurement equivalence.…”