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Testing symmetric properties of distributionsby: Paul Valiant
In STOC '08: Proceedings of the 40th annual ACM symposium on Theory of computing (2008), pp. 383-392.
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AbstractWe introduce the notion of a Canonical Tester for a class of properties on distributions, that is, a tester strong and general enough that "a distribution property in the class is testable if and only if the Canonical Tester tests it". We construct a Canonical Tester for the class of symmetric properties of one or two distributions, satisfying a certain weak continuity condition. Analyzing the performance of the Canonical Tester on specific properties resolves several open problems, establishing lower bounds that match known upper bounds: we show that distinguishing between entropy <α or >β on distributions over [n] requires n α/β- o(1) samples, and distinguishing whether a pair of distributions has statistical distance <α or >β requires n 1-o(1) samples. Our techniques also resolve a conjecture about a property that our Canonical Tester does not apply to: distinguishing identical distributions from those with statistical distance >β requires Ω(n 2/3 ) samples.
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