Jonge, Tineke; Veenhoven, Ruut; Arends, Lidia - In: Social Indicators Research 117 (2014) 1, pp. 275-300
Survey data are often used for comparison purposes, such as comparisons across nations or comparisons over time. To be effective, this would require equivalent questions and equivalent responses options to the questions. Yet there is a lot of variation in the response scales used, which, for...
