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. 2016 Mar 16;16(3):381. doi: 10.3390/s16030381

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Variance and Time complexity vary with different $ρ^{C r o w d}$ . (a) Variance of the estimation; (b) Time for building the virtual database.