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. 2014 Aug 15;14:850. doi: 10.1186/1471-2458-14-850

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© Zhang et al.; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Posterior distributions of “Completeness” coefficient β _j,t,m ( m = 2,..,5; j = 4,…,9) in “completeness” parameter θ _j,t (multiplier for the estimated incidence rate) as measure of correspondence between surveillance and the information environment proxy data for surveillance systems that are less correlated with the information environment during the pandemic period. β2 is the coefficient for Google search index of seasonal flu terms; β3 is the coefficient for Google search index for symptoms; β4 is the coefficient for Google search index of medications; β5 is the coefficient for Google search index of non-flu terms.