Table 3.

Accuracy of RI-TIMEX Normalization at Each Step

	By Type	By Type Accuracy (%)
Extraction	Overall	82.12*
Anchor point	Overall	74.68
	Admission date (286)	91.56
	Discharge date (95)	50.67
	Previous Timex (166)	64.42
	Previous Absolute Timex (136)	77.78
Anchor relation	Overall	87.71
	Before (58)	68.97
	After (221)	90.06
	Equal/During (197)	90.29
Normalization	Overall	57.2

The number of cases in each class is shown in parentheses next to its class label. (The * value for TIMEX extraction is a recall measure result).