Discrimination Analysis for Predicting Defect-Prone Software Modules

Table 1

Symbols of the discriminant analysis.

Symbol	Description
𝑆𝑏, 𝑆^Φ𝑏	The between-class scatter matrix
𝑆𝑤, 𝑆^Φ𝑤	The within-class scatter matrix
𝑛𝑖	The number of the instances of 𝑖th class
𝑊, Ψ	The transformation matrix
𝑐1, 𝑐2	The classes of nondefective and defective software module
𝜇	Mean vector of total instances
𝑢𝑖	Mean vector of 𝑖th class
𝑥^𝑖𝑗	The 𝑗th instances in the 𝑖th class
𝑇𝑟, 𝑇^′𝑟	Original and transformed training data
𝑇𝑒, 𝑇^′𝑒	Original and transformed test data