Specific features

[andreaskutka]

Problem
Some specific behaviour is suspicious but is not yet explicitly checked for.

Solution
Build some specific features/scores that check for particular events, e.g.:

• Sequence jumps to TimeStamps questions are more suspicious than for other questions
• GPS questions recorded at different time than most of the interview.
• If GPS question outlier and record at the same time as most of the interview, bad sign.
• Large GPS accuracy values (low accuracy) is indicative of wrong tablet settings.
• Removing or changing the answers to gating questions (either linked or trigger enablement) may be indicative of interviewers trying to cut the length if an interview, especially at the beginning of a survey.