Statistical and Machine Learning Methods for Software Fault Prediction Using CK Metric Suite: A Comparative Analysis

Table 3

Radial function.

Radial function	Mathematical expression
Gaussian radial function	𝜙(𝑧)=𝑒^−(𝑧2/2𝜎2)
Thin plate spline	𝜙(𝑧)=𝑧^2log𝑧
Quadratic	𝜙(𝑧)=(𝑧^2+𝑟^2)^1/2
Inverse quadratic	1𝜙(𝑧)=(𝑧^2+𝑟^2)^1/2