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Table A.1

Features used in the article error correction system trained discriminatively. wB and wA denote the word immediately before and after the target, respectively; and pB and pA denote the POS tag before and after the target. headW denotes the NP head. NC stands for noun compound and is active if the second to last word in the NP is tagged as a noun. Verb features are active if the NP is the direct object of a verb. Preposition features are active if the NP is immediately preceded by a preposition. Adj feature is active if the first word (or the second word preceded by an adverb) in the NP is an adjective. NpWords and npTags denote all words (POS tags) in the NP. Adapted models also use the author's article as a feature.

Feature typeFeature groupFeature list
Word  wB, w2B, w3B, wA, w2A, w3A, wBwA, w2BwB, wAw2A, w3Bw2BwB, w2BwBwA, wBwAw2A, wAw2Aw3A, w4Bw3Bw2BwB, w3Bw2BwBwA, w2BwBwAw2A, wBwAw2Aw3A, wAw2Aw3w4A 
 
POS  pB, p2B, p3B, pA, p2A, p3A, pBpA, p2BpB, pAp2A, pBwB, pAwA, p2Bw2B, p2Aw2A, p2BpBpA, pBpAp2A, pAp2Ap3A 
 
 NP1 headW, npWords, NC, adj&headW, adjTag&headW, adj&NC, adjTag&NC, npTags&headW, npTags&NC 
 
 NP2 headW&headPOS, headNumber 
 
Chunk wordsAfterNP headW&wordAfterNP,npWords&wordAfterNP,headW&2wordsAfterNP, npWords&2wordsAfterNP,headW&3wordsAfterNP, npWords&3wordsAfterNP 
 
 wordBeforeNP wB&fiiNP1 
 
 Verb verb, verb&fiiNP1 
 
 Preposition prep&fiiNP1 
Feature typeFeature groupFeature list
Word  wB, w2B, w3B, wA, w2A, w3A, wBwA, w2BwB, wAw2A, w3Bw2BwB, w2BwBwA, wBwAw2A, wAw2Aw3A, w4Bw3Bw2BwB, w3Bw2BwBwA, w2BwBwAw2A, wBwAw2Aw3A, wAw2Aw3w4A 
 
POS  pB, p2B, p3B, pA, p2A, p3A, pBpA, p2BpB, pAp2A, pBwB, pAwA, p2Bw2B, p2Aw2A, p2BpBpA, pBpAp2A, pAp2Ap3A 
 
 NP1 headW, npWords, NC, adj&headW, adjTag&headW, adj&NC, adjTag&NC, npTags&headW, npTags&NC 
 
 NP2 headW&headPOS, headNumber 
 
Chunk wordsAfterNP headW&wordAfterNP,npWords&wordAfterNP,headW&2wordsAfterNP, npWords&2wordsAfterNP,headW&3wordsAfterNP, npWords&3wordsAfterNP 
 
 wordBeforeNP wB&fiiNP1 
 
 Verb verb, verb&fiiNP1 
 
 Preposition prep&fiiNP1 
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