Electronic surveys are an important resource in data mining. However, how to protect respondents’ data privacy during the survey is a challenge to the security and privacy community. In this paper, we develop a scheme to solve the problem of privacy-preserving data mining in electronic surveys. We propose a randomized response technique to collect the data from the respondents. We then demonstr...

Given a function f that depends on m parameters, the problem is to identify an “active subspace” of dimension k ≪ m, where f is most sensitive to change, and then to approximate f by a response surface over this lower-dimensional active subspace. We present a randomized algorithm for determining k and computing an orthonormal basis for the active subspace. We also derive a tighter probabilistic...

BACKGROUND Human immunodeficiency virus (HIV) is spreading rapidly among men who have sex with men (MSM) in China. Anonymous questionnaires or direct interviews have been frequently used to study their behavior. The aim of the study was to describe the behavioral risk profile of the MSM in Beijing using the randomized response techniques (RRTs). METHODS A cross-sectional survey of sexual beha...

PURPOSE This study assessed, for the first time, prevalence estimates for physical and cognitive doping within a single collective of athletes using the randomized response technique (RRT). Furthermore, associations between the use of legal and freely available substances to improve physical and cognitive performance (enhancement) and illicit or banned substances to improve physical and cogniti...