Table 2.

Attribute information of the datasets.

Number	Attribute type	Quality metrics	Attribute definition
1	McCabe's measure	loc	Line count of code
2		v(g)	Cyclomatic complexity
3		ev(g)	Essential complexity
4		iv(g)	Design complexity
5	Basic Halstead measures	loCode	Line count
6		loComment	Count of lines of comments
7		loBlank	Count of blank lines
8		loCodeAndComment	Count of code and comment lines
9		uniqOp	Unique operators
10		uniqOpnd	Unique operands
11		total_Op	Total operators
12		total_Opnd	Total operands
13		branchCount	Branch count of the flow graphs
14	Derived Halstead measures	n	Total operators + operands
15		v	Volume
16		l	Program length
17		d	Difficulty
18		i	Intelligence
19		e	Effort
20		b	Estimate of the effort
21		t	Time estimator
22	Output defect measure	Defects	{false, true}: module has/does not have one or more reported defects