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MathML

\begin{array}{lcl} concordance index c (AUC) & = & (n_{c} + 0.5 n_{t}) / n \\ Somers' D (Gini coefficient) & = & (n_{c} - n_{d}) / n \\ Goodman-Kruskal gamma & = & (n_{c} - n_{d}) / (n_{c} + n_{d}) \\ Kendall's tau- a & = & (n_{c} - n_{d}) / (0.5 N (N - 1)) \end{array}

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Math as LaTeX Source

\[ \begin{array}{lcl} \text {concordance index } c \text { (AUC)} & =& (n_ c+0.5n_ t)/n \\ \text {Somers' } D \text { (Gini coefficient) } & =& (n_ c-n_ d)/n \\ \text {Goodman-Kruskal gamma } & =& (n_ c-n_ d)/(n_ c+n_ d) \\ \text {Kendall's tau-}a & =& (n_ c-n_ d)/(0.5N(N-1)) \end{array} \]