Figure 4

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.