They write in the abstract that «The primary methodology of the survey was a list experiment (also known as item count technique), a survey technique designed t

They write in the abstract that «The primary methodology of the survey was a list experiment (also known as item count technique), a survey technique designed to maximize respondents’ privacy.» https://en.wikipedia.org/wiki/Unmatched_count https://en.wikipedia.org/wiki/Unmatched_count