Table 3.
Correlation of social media stance with reported US measles cases , 2009–2016. Posts on Twitter and Facebook were classified by the BrightView classifier (Crimson Hexagon) as indicated in the text. Both CDC weekly reported cases and the increase in the cumulative case count were used (see text for details). Spearman rank correlations are reported, with confidence intervals derived from time series bootstrap.
| Medium | Classification | Weekly measles | Differenced cumulative measles |
|---|---|---|---|
| Total | 0.11 (−0.02 to 0.22) | 0.15 (−0.02 to 0.31) | |
| Pro | 0.22 (0.09 to 0.34) | 0.28 (0.13 to 0.41) | |
| Hesitant | 0.01 (−0.13 to 0.14) | 0.04 (−0.13 to 0.22) | |
|
| |||
| Total | 0.06 (−0.08 to 0.18) | 0.06 (−0.11 to 0.22) | |
| Pro | 0.21 (0.06 to 0.34) | 0.27 (0.11 to 0.41) | |
| Hesitant | 0.0011 (−0.12 to 0.12) | −0.02 (−0.18 to 0.14) | |