Natural Language Processing Based Instrument for Classification of Free Text Medical Records

Table 3

Retrieval analysis (shrink case/SVM).

Calculation formulas							tp/(tp + fn)	tp/(tp + fp)	/()	(tp + tn)/(tp + fp + fn + tn)	(fp + fn)/
Medical tests performed	Total testing documents	Retrieved	True positive (tp)	False positive (fp)	False negative (fn)	True negative (tn)				Acc	ERR
Ultrasonography	11.140	5.802	5004	798	140	5.198	0,973	0,862	0,914	0,916	0,084
X-ray		5.478	5010	468	252	5.410	0,952	0,915	0,933	0,935	0,065
Endoscopy		872	705	167	29	9.701	0,960	0,808	0,878	0,982	0,018