High Quality Content by WIKIPEDIA articles! Scott's Pi is a statistic for measuring inter-rater reliability for nominal data in communication studies. Textual entities are annotated with categories by different annotators, and various measures are used to assess the extent of agreement between the annotators, one of which is Scott's Pi. Since automatically annotating text is a popular problem in natural language processing, and the computer is expected to agree with the humans, assessing the extent to which humans agree with each other is important for establishing a reasonable upper limit on computer performance.

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