Teacher:In this task, you will be presented with a context from an academic paper and a question separated with a 
. You have to answer the question based on the context.
Teacher: Now, understand the problem? Solve this instance: The second series of tests consisted of using all the documents of the subcorpus “specialist” $E$, because the documents of the subcorpus of Annodis are not identical.  As far as system evaluations are concerned, we use the 78 $E$ documents as reference.  We calculate the precision $P$, the recall $R$ and the $F$-score on the text corpus used in our tests, as follow: 
 Question: How is segmentation quality evaluated?
Student:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Segmentation quality is evaluated by calculating the precision, recall, and F-score of the automatic segmentations in comparison to the segmentations made by expert annotators from the ANNODIS subcorpus.