An Empirical Study on the Impact of Duplicate Code

Table 5

Ratio of duplicate code—Experiment 1.

(a) Experiment 1.1

Software Name	ccf	ccfx	sim	sco
EclEmma	13.1%	—	—	—
FileZilla	22.6%	—	—	—
FreeCol	23.1%	—	—	—
SQuirrel	29.0%	—	—	—
WinMerge	23.6%	—	—	—

(b) Experiment 1.2

Software Name	ccf	ccfx	sim	sco
ThreeCAM	29.8%	10.5%	4.1%	26.2%
DatabaseToUML	21.4%	25.1%	7.6%	11.8%
AdServerBeans	22.7%	18.2%	20.3%	15.9%
NatMonitor	9.0%	7.7%	0.7%	6.6%
OpenYMSG	17.4%	9.9%	5.8%	9.9%
QMailAdmin	34.3%	19.6%	8.8%	—
Tritonn	13.8%	7.5%	5.5%	—
Newsstar	7.9%	4.8%	1.5%	—
Hamachi-GUI	36.5%	23.1%	18.5%	—
GameScanner	23.1%	13.1%	6.6%	—