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authorStratis Ioannidis <stratis@stratis-Latitude-E6320.(none)>2012-11-05 12:45:26 -0800
committerStratis Ioannidis <stratis@stratis-Latitude-E6320.(none)>2012-11-05 12:45:26 -0800
commitc5438848e77fca83bdf022efe002204a8273a2bb (patch)
tree8bc9859fb8c6fea00e9635302e96806b89f89712
parentf96f3e9a7233fbd170a375232a7740a3913bcc18 (diff)
downloadrecommendation-c5438848e77fca83bdf022efe002204a8273a2bb.tar.gz
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@@ -15,13 +15,13 @@ a truthful, $O(\log^3 n)$-approximate mechanism
\cite{dobz2011-mechanisms} as well as a universally truthful, $O(\frac{\log n}{\log \log n})$-approximate mechanism for subadditive maximization
\cite{bei2012budget}. Moreover, in a Bayesian setup, assuming a prior distribution among the agent's costs, there exists a truthful mechanism with a 768/512-approximation ratio \cite{bei2012budget}. %(in terms of expectations)
- A series of recent papers \cite{mcsherrytalwar,approximatemechanismdesign,xiao:privacy-truthfulness,chen:privacy-truthfulness} consider the related problem of retrieving data from an \textit{unverified} database: the auctioneer cannot verify the data reported by individuals and therefore must incentivize them to report this truthfully.
+ A series of recent papers \cite{mcsherrytalwar,approximatemechanismdesign,xiao:privacy-truthfulness,chen:privacy-truthfulness} consider the related problem of retrieving data from an \textit{unverified} database: the auctioneer cannot verify the data reported by individuals and therefore must incentivize them to report truthfully.
McSherry and Talwar \cite{mcsherrytalwar} argue that \emph{differentially private} mechanisms offer a form of \emph{approximate truthfulness}: if users have a utility that depends on their privacy, reporting their data untruthfully can only increase their utility by a small amount. Xiao \cite{xiao:privacy-truthfulness}, improving upon earlier work by Nissim \emph{et al.}~\cite{approximatemechanismdesign}, constructs mechanisms that
simultaneously achieve exact truthfulness as well as differential privacy. Eliciting private data through a \emph{survey} \cite{roth-liggett}, whereby individuals first decide whether to participate in the survey and then report their data,
also falls under the unverified database setting \cite{xiao:privacy-truthfulness}. In the \emph{verified} database setting, Ghosh and Roth~\cite{ghosh-roth:privacy-auction} and Dandekar \emph{et al.}~\cite{pranav} consider budgeted auctions where users have a utility again captured by differential privacy. Our work departs from the above setups in that utilities do not involve privacy, whose effects are assumed to be internalized in the costs reported by the users; crucially, we also assume that experiments are tamper-proof, and individuals can misreport their costs but not their values.
\sloppy
-Our work is closest to the survey setup of Roth and Schoenebeck~\cite{roth-schoenebeck}, who also consider how to sample individuals with different features who reported a hidden value at a certain cost. The authors assume a prior on the joint distribution between costs and features, and wish to obtain an unbiased estimate of the expectation of the hidden value under the constraints of truthfulness, budget feasibility and individual rationality. Our work departs by learning a more general statistic (a linear model) than data means. We note that, as in \cite{roth-schoenebeck}, costs and features can be arbitrarily correlated (our results are prior-free).
+Our work is closest to the survey setup of Roth and Schoenebeck~\cite{roth-schoenebeck}, who also consider how to sample individuals with different features who report a hidden value at a certain cost. The authors assume a prior on the joint distribution between costs and features, and wish to obtain an unbiased estimate of the expectation of the hidden value under the constraints of truthfulness, budget feasibility and individual rationality. Our work departs by learning a more general statistic (a linear model) than data means. We note that, as in \cite{roth-schoenebeck}, costs and features can be arbitrarily correlated (our results are prior-free).
\fussy