Interviewers have long been identified as a source of error in face-to-face surveys. However, previous studies have typically focused on a single source of interviewer-related error and single-country cross-sectional surveys. We extend this literature by investigating the influence of...

Interviewers have long been identified as a source of error in face-to-face surveys. However, previous studies have typically focused on a single source of interviewer-related error and single-country cross-sectional surveys. We extend this literature by investigating the influence of...

A survey with validation question was delivered to 3475 respondents to study the impact of using validation question to improve data quality. Results show that The respondents who passed the validation question had significantly older ages, higher median incomes and higher education levels. The...