Filters cooccurrences if more than
PARAM_MAXIMUM_ENTITIES occur in a
sentence. Improves precision at the cost of recall.
*
We tested two simple modifications of the sentence-level co-occurrence
technique. The first reduces co-occurrence predictions to sentences with a
limited number of brain region mentions. By extracting co-occurring pairs
from sentences with only two brain region mentions, precision reaches 23.1%
and 17.2% recall (f-measure 1⁄4 19.7%). This means that an average sentence
with two brain region mentions is reporting a connection in almost one of
four cases. By varying this threshold, the f-measure increases until
sentences with six or more brain region mentions are included. We observed
that some of these larger sentences merely list brain regions involved in the
study and not their relationships. By limiting the threshold at five
brain region mentions or less per sentence, co-occurrence provides 18.8%
precision and 66.1% recall.(French 2012)