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Longitudinal analysis of sentiment and emotion in news media headlines using automated labelling with Transformer language models

Fig 2

Average yearly sentiment of headlines grouped by the ideological leanings of news outlets using human ratings of outlets political bias from the 2019 AllSides Media Bias Chart v1.1 [24].

The figure displays the standard error bars of the average yearly sentiment for outlets within each color-coded political orientation category. For each ideological grouping, statistical tests for the null hypothesis of zero slope are shown on the bottom left of the plot.

Fig 2

doi: https://doi.org/10.1371/journal.pone.0276367.g002