Table 5. Considered variants of the MI metric.

Acronym	Meaning	Formula
MIO	Original maintainability index	171.0 − 5.2 * ln(V) − 0.23 * CC − 16.2 * ln(SLOC)
MISEI	MI by Software Engineering Institute	$171.0-5.2\ast {\log }_2(V)-0.23\ast \mathrm{C}\mathrm{C}-16.2\ast {\log }_2(\mathrm{S}\mathrm{L}\mathrm{O}\mathrm{C})+50.0\ast \sin \left(\sqrt{2.4\ast (\mathrm{C}\mathrm{L}\mathrm{O}\mathrm{C}/\mathrm{S}\mathrm{L}\mathrm{O}\mathrm{C})}\right)$
MIVS	MI implemented in Visual Studio	max(0, (171 − 5.2 * ln(V) − 0.23 * CC − 16.2 * ln(SLOC)) * 100/171)