1 Erratum to: Qual Quant DOI 10.1007/s11135-015-0266-1

Equation 6 has been published incorrectly in the original article. The correct version of the equation is provided in this erratum.

$$ _{\left|u\right.}\alpha _{{{\text{binary}}}} = 1-\frac{{_{\left| u \right.}D_{o} }} {_{\left| u \right.}D_{e}} = 1 - \frac{{\ell _{{\phi \ne \phi }} }}{{\varepsilon _{{\phi \ne \phi }} }} = 1 - \left( {\ell .. - \frac{1}{{\ell ..}}\sum\nolimits _{i}^{m} \sum\nolimits _{g} \left\{ {\begin{array}{l} {L\left(S_{{ig\ {\text{valued}} = \phi }}\right )} \\ {\left(L\left(S_{{ig\ {\text{valued}} \ne \phi }}\right)\right)^{2} } \\ \end{array} } \right\}} \right) \frac{{\ell _{{\phi \ne \phi }} }}{{\ell _{{\phi ^{{\varvec{.}} } }} \cdot \ell_{{}^{{\varvec{.}}}{{ \ne \phi }} }}} $$
(6)