INTERNATIONAL JOURNAL OF PUBLIC OPINION RESEARCH, cilt.36, sa.4, ss.1-20, 2024 (SSCI)
Although quality aspects of survey data have been well-investigated in the methodological literature, little is known about the effects of showcard use on data quality. This study sought to examine the impact of the degree of showcard use on data quality, focusing on item-missing data and middle-point selection for a selected set of questions. The data come from the European Social Survey Round 9 (ESS9), which covers 29 European countries. Our findings suggest that showcards used in face-to-face surveys significantly reduce the presence of item-missing data and middle-point selection, even if only some of them are used during interviews. This study presents different strategies that may be employed for questionnaire design, interviewer training, and data collection.