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Table 4 Analysis of false negatives in the test dataset.

From: Exploring Spanish health social media for detecting drug effects

Error cause False Negatives Examples
Long distance between pair entities 254 FN1
Syntactically Complex phrases 76 FN2
Simple phrases 14 FN3
Modifier needed for full understanding 10 FN4
Co-reference resolution required 6 FN5
Total 414