Term Definition
Comparability

The extent to which differences between survey statistics from different countries, regions, cultures, domains, time periods, etc., can be attributable to differences in population true values (Johnson & Mohler, 2010). In other words, whether the concepts are comparable or not. It is often referred as “equivalence, functional equivalence, similarity, or some other frame of reference” (Johnson & Mohler, 2010). Improving comparability implies that error due to translation has to be minimized. In terms of questionnaire translation for multi-national, multi-cultural and multi-regional surveys the aim is to achieve the defined statistical level of comparability across all local versions (expressed in minimized translation error).