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. 2021 Dec 13;29(3):472–480. doi: 10.1093/jamia/ocab261

Table 1.

Performance of keyword search using unigrams, bigrams, and a combination of both

Precision Recall F1 score
Unigrams 0.043 (±0.02) 0.927 (±0.04) 0.081 (±0.03)
Bigrams 0.429 (±0.06) 0.635 (±0.04) 0.512 (±0.05)
Unigrams + bigrams 0.047 (±0.00) 0.895 (±0.04) 0.089 (±0.00)

Note: Results are reported as mean (±95% confidence intervals) obtained from 10-fold cross-validation on the training set