The Webis-Editorials-18 corpus comprises 1000 news editorials that are annotated in accordance with a new notion for argumentation quality. The notion regards whether an editorial brings readers of opposing beliefs closer together or rather increases the gap between them. In particular, we label each editorial in the corpus as challenging, reinforcing, or no-effect. To account for the political ideology of the target readers, each editorial is labelled by three liberals and three conservatives.
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