Discourse Level Factors for Sentence Deletion in Text Simplification
Table 5: Fraction of discourse relations that govern the sentence’s sub-tree. Arrows indicate significance (p<0.05) using the Wilcoxon ranked test; ↑: higher presence among deleted sentences than the kept ones; ↓: lower.
['[EMPTY]', 'Middle Kept', 'Middle Deleted', 'Elementary Kept', 'Elementary Deleted']
To this end, we study the lowest ancestor relation to which it is attached as a satellite, henceforth the “governing” relation. Important sentences that are not satellites to any relation (root) is significantly less likely to be deleted across both levels. Furthermore, sentences that serve as an explanation of an existing sentence are less likely to be deleted during simplification (significantly, for the middle school level).