Figure 1.
(A) Total number of negative (red), positive (green), and neutral (blue) tweets relating to influenza A(H1N1) vaccination during the Fall wave of the 2009 pandemic.
(B) Daily (gray) and 14 day moving average (blue) sentiment score during the same time. (C) Correlation between estimated vaccination rates for individuals older than 6 months, and sentiment score per HHS region (black dots) and states (gray dots). Numbers represent the ten regions as defined by the US Department of Human Health & Services. Lines shows best fit of linear regression (blue for regions, red for states).
Figure 2.
(A) Proportion of negative sentiments p(-) in the network communities. Dashed line shows overall proportion in the opinionated network.
The proportions of negative and positive sentiments are significantly different from the overall proportions in the entire opinionated network (with the exception of community E). (B) Effect of positive assortativity index (r) on relative risk increase (compared to risk at r∼0) of disease outbreaks that infect at least 3% of the population. Blue line shows best fit of linear regression (confidence interval based on standard error). (C) Relative risk increase (compared to risk at r∼0) of disease outbreaks of a given fraction of the population (on horizontal axis) for two values of assortativity index (r), 0.075 (red) and 0.145 (green). Note that the latter corresponds to r found in the opinionated network (see main text).