In the article, the authors discuss asking each survey respondent what their "porn star" name is. They explain:
"We trialed the uniqueness and reliability of a novel identifying characteristic: first pet's name and first street - colloquially known as a "porn star name".The authors provide a table of examples of porn star names, of which 'Honey Scotsburn' and 'Precious Duckholes' were two (I'm not making this up - check the paper). They then go on to test whether they could match respondents from a baseline and follow-up survey based on the porn star name. Porn star names were unique to 99% of their 1281 respondents to the baseline survey, and adding month/year of birth was enough to provide 100% uniqueness. When re-contacted later, they were able to match 76% of respondents between the two surveys using only the porn star name, and using month/year of birth they could further match 96% of those who provided a partially-consistent porn star name.
It seems this is a pretty unique way of matching respondents between waves of a survey while maintaining plausible anonymity for those respondents. However, the authors note that "calling the identifier a PSN... might also have made the question seem trivial to some participants and resulted in false responses". Of course, this could all be a joke - Lim and Hellard were also two co-authors on research about the survival of teaspoons. Even if this paper was taken seriously (and it could be, since it addresses a real issue), it seems the research community isn't interested - this paper has only been cited twice since it was published in 2011.
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