Local versus Global Models for Just-In-Time Software Defect Prediction

Table 2

The description of metrics.

Dimension	Metric	Description
Diffusion	NS	Number of modified subsystems
	ND	Number of modified directories
	NF	Number of modified files
	Entropy	Distribution of modified code across each file
Size	LA	Lines of code added
	LD	Lines of code deleted
	LT	Lines of code in a file before the change
Purpose	FIX	Whether or not the change is a defect fix
History	NDEV	Number of developers that changed the files
	AGE	Average time interval between the last and the current change
	NUC	Number of unique last changes to the files
Experience	EXP	Developer experience
	REXP	Recent developer experience
	SEXP	Developer experience on a subsystem