Erratum to: The Potential of Direct Democracy: A Global Measure (1900–2014)

1 Erratum to: Soc Indic Res DOI 10.1007/s11205-016-1408-0

Unfortunately, in the original publication of the article, the formula (2) and formula (3) in the page 9 and 11 are incorrect. The correct formulas are given in this erratum.

In the page 9, Formula (2),

$$ {\text{Effectiveness}}\;{\text{Potential}} = \left( {1 - {\text{SQS}}} \right) / 0. 5*\left( {\text{AQ}} \right) $$

In the page 11, line number four, participation, approval, supermajority $( 1 - {\text{SQS}}_{xti}) / 0. 5$

In the page 11, Formula (3),

$$ {\text{MDD}}\_{\text{PP}}_{xt} = \left[ {\left( {\exists_{xti} } \right)\left( {1 - {\text{S}}_{xti} } \right)\left( {{\text{CT}}_{xti} } \right) + \left( {1 - {\text{SQS}}_{xti} } \right)/0.5\left( {{\text{AQ}}_{xti} } \right)} \right]\left( {{\text{D}}_{xti} } \right)\left( {{\text{T}}_{xti} } \right) $$