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J Am Med Inform Assoc 14:304-311 doi:10.1197/jamia.M2284
  • Original Investigation

A Novel Hybrid Approach to Automated Negation Detection in Clinical Radiology Reports

Table 4

Source of Errors Calculated on 132 Radiology Reports

Source of Errors False Negatives False Positives
Verb: gerund or present participle 2 7.7% 0 0.0%
Verb: past particle or past tense 2 7.7% 0 0.0%
Other 9 34.6% 3 75.0%
Missing negation signal 2 7.7% 0 0.0%
Missing phrase pattern 9 34.6% 0 0.0%
Irregular use and other 2 7.7% 1 25.0%
Total 26 100% 4 100%

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