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. Author manuscript; available in PMC: 2020 Sep 1.
Published in final edited form as: Health Informatics J. 2017 Nov 17;25(3):1116–1132. doi: 10.1177/1460458217740723

Table 1.

Agreement of stance classification of social media posts by three human raters and automated algorithm. The columns show the fraction of time each of the individual raters agreed with a machine classification of vaccine hesitant versus pro-vaccination. All four possible categories were included when computing agreement.

Platform Machine Total Rater 2 Rater 1 Rater 3
Facebook Hesitant 92 67.4% 60.9% 69.6%
Pro 92 59.8% 58.7% 64.1%

Twitter Hesitant 250 67.2% 64.4% 66.4%
Pro 106 72.6% 72.6% 71.7%