Vertaile menetelmiä

	Negation Detection	Tiedonlouhinta – Tekstin muuttaminen jäsennellyiksi tiedoiksi
Tieteenala	Tekstinlouhinta	Tekstinlouhinta
Menetelmäperhe	Process / pipeline	Process / pipeline
Syntyvuosi	2001 (NegEx); scope learning formalised by 2009	—
Kehittäjä	Chapman et al. (NegEx algorithm, 2001); Morante & Daelemans (scope learning, 2009)	—
Tyyppi	NLP information-extraction task	NLP structured-information task
Alkuperäislähde	Chapman, W.W., Bridewell, W., Hanbury, P., Cooper, G.F., & Buchanan, B.G. (2001). A Simple Algorithm for Identifying Negated Findings and Diseases in Discharge Summaries. Journal of the American Medical Informatics Association, 8(6), 606-614.	Cowie, J. & Lehnert, W. (1996). Information Extraction. Communications of the ACM.
Rinnakkaisnimet	negation scope identification, negation cue detection, Olumsuzlama Tespiti (Negation Detection)	IE, structured information extraction, Bilgi Çıkarma (Information Extraction)
Liittyvät	6	4
Tiivistelmä	Negation detection is a natural-language-processing task that locates negation cues in text — words or phrases such as 'no', 'not', 'without', or 'denies' — and determines the span of text (the scope) whose meaning those cues invert. Formalised for clinical text by Chapman et al. (2001) with the NegEx algorithm and extended to scope learning in biomedical literature by Morante and Daelemans (2009), the method is essential wherever the difference between a finding being present and its being explicitly ruled out carries real consequences.	Information extraction (IE) is a natural-language-processing task that converts unstructured text into structured information — such as events, relations, and attributes — so that facts buried in free-form documents become machine-readable records. The task was consolidated in early surveys by Cowie and Lehnert (1996) and later by Grishman (2012).