Identifying influential metrics in the combined metrics approach of fault prediction

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Table 3 Statistical measures with (WI) and without (WOI) interaction of metrics

Metrics	Mylyn		PDE		Eclipse		Equinox		Lucene		No of variables
	R²	Adj R²	R²	Adj R²	R²	Adj R²	R²	Adj R²	R²	Adj R²	No of variables
CK (WOI)	0.1186	0.1157	0.0614	0.0576	0.3856	0.3818	0.5652	0.5570	0.3838	0.3784	6
CK (WI)	0.1877	0.1784	0.0976	0.0848	0.5318	0.5217	0.6826	0.6605	0.4202	0.4020	21
OO (WOI)	0.1757	0.1708	0.6271	0.6243	0.4129	0.4064	0.6320	0.6191	0.2457	0.2335	11
OO (WI)	0.3516	0.3277	0.7049	0.6912	0.6210	0.5941	0.8349	0.7925	0.5774	0.4996	66
CK + OO (WOI)	0.2024	0.1950	0.6439	0.6398	0.4280	0.4190	0.6906	0.6730	0.4049	0.3899	17
CK + OO (WI)	0.4784	0.4316	0.7683	0.7419	0.7933	0.7558	0.9384	0.8830	0.6847	0.5948	153