Extension of Object-Oriented Metrics Suite for Software Maintenance

Table 3

Correlating metrics with project data.

(a) Correlating proposed complexity metrics with project data

Metric	MMC			SDMC			PNC
	System 1	System 2	System 3	System 1	System 2	System 3	System 1	System 2	System 3
REV	0.444*	0.218	−0.315	0.190*	0.141	−0.369	0.307*	0.154	0.085
DEF	0.573*	0.218	—	0.394*	0.141	—	0.230*	0.154	—
COR	0.515*	0.218	—	0.307*	0.141	—	0.243*	0.154	—

(b) Correlating proposed impact metrics with project data

Metric	CI			MNI
	System 1	System 2	System 3	System 1	System 2	System 3
REV	0.229*	0.001	−0.176	0.437*	0.097	−0.207
DEF	0.174	0.001	—	0.436*	0.097	—
COR	0.200*	0.001	—	0.491*	0.097	—

(c) Correlating proposed dependence metrics with project data

Metric	CD			MND
	System 1	System 2	System 3	System 1	System 2	System 3
REV	0.624*	0.031	−0.038	0.495*	0.098	0.070
DEF	0.745*	0.031	—	0.487*	0.098	—
COR	0.703*	0.031	—	0.477*	0.098	—

(d) Correlating proposed inheritance metrics with project data

Metric	ID			WDI
	System 1	System 2	System 3	System 1	System 2	System 3
REV	0.376*	−0.047	—	−0.025	0.032	—
DEF	0.249*	−0.047	—	−0.025	0.032	—
COR	0.256*	−0.047	—	0.032	0.032	—