Identifying Areas of Vote Concentration: Evidence from the System

The work of Avelino et al (2011) proposes the G index, an important indicator to estimate the regional concentration of parliamentary votes in multi-member electoral districts. However, this indicator does not provide information about the votes a candidate received in sub-areas inside a district. Furthermore, by referring to an aggregate level of analysis - the district – it is not possible to disaggregate information to lower levels such as municipalities. Therefore, this work proposes the use of two alternative indicators: the Location Quotient (LQ) and the Horizontal Clustering (HC) in order to overcome these difficulties. These indices were applied to all congressmen elections from 1994 to 2010. The application serves the research objectives as it clearly identifies the location of the votes received by a candidate within the electoral district.

From Andreza Davidian.