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

Table 4

Retrieval analysis (classic 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	5.798	4.657	1.141	487	4.855	0,905	0,803	0,851	0,854	0,146
X-ray		5.784	4.703	1.081	559	4.797	0,894	0,813	0,852	0,853	0,147
Endoscopy		881	708	173	26	9.698	0,965	0,804	0,877	0,981	0,019