The paper maps out possibilities to reduce non-sampling errors such as observing suitable interview duration and timing and matching interviewer characteristics with those of respondents.
The average interview duration was monitored for each interviewer with the intention of minimising respondent burden and keeping within the study budget.
Mean interview duration was 68 minutes (range: 34 - 95 minutes).
The questionnaire ensured collection of reliable, comparable quality data within a minimum interview duration for nomadic herders.
The Sunday Politics remit and interview duration means we are able to carry out proper forensic interviews on such matters.
The second follow-up wave, which was conducted in 2015, concentrated on the assessment of basic skills and the repetition of several questionnaire items from PIAAC (full interview duration: 100 min on average).
The mean interview duration was 40 minutes.
The average interview duration was 20 minutes.
Mean interview duration was about 50 minutes.
