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Detecting Errors in English Article Usage with a Maximum Entropy Classifier Trained on a Large, Diverse Corpus
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Detecting Errors in English Article Usage with a Maximum Entropy Classifier Trained on a Large, Diverse Corpus
One of the most difficult challenges faced by non-native speakers of English is mastering the system of English articles. We trained a maximum entropy classifier to select among a/an, the, or zero article for noun phrases, based on a set of features extracted from the local context of each. When the classifier was trained on 6 million noun phrases, its performance was correct about 88% of the time. We also used the classifier to detect article errors in the TOEFL essays of native speakers of Chinese, Japanese, and Russian. Agreement with human annotators was about 88% (kappa = 0.36). Many of the disagreements were due to the classifier's lack of discourse information. Performance rose to 94% agreement (kappa = 0.47) when the system accepted noun phrases as correct in cases where its own confidence was low.
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