score to capture straighlining/firsting/lasting

[andreaskutka]

Problem

Straightlining (tendency to select the same answer option on a scale, e.g. "good"), lasting (always the last option, especially on CATI) or firsting (the first option) are known unwanted behaviours in interviews. We capture the distribution by question and interviewer in f__answer_position, but not the combination within one interview file, e.g. if 5 consecutive questions all contain the same answer position. Given the vertical outline of radio buttons for responses in Survey Solutions, straighlining is potentially less of an issue.