Part I: Introduction - The EBC's methodology

  1. The data provided by DPCD was based entirely on projected population. The EBC calculated the projected population deviation for each district by comparing its projected population as at 30 June 2018 with average projected population. The EBC further refined its methodology, using enrolment rates (enrolled electors divided by the estimated adult population) by district as at 30 June 2011 to calculate estimated enrolments as at 30 June 2018. Enrolment rates vary markedly, from 49.05 per cent in Melbourne to 95.89 per cent in Eltham, and are affected by factors such as the number of non-citizens and population mobility. Although the character of districts may change over time, the EBC’s methodology offers a good overall method to estimate projected enrolments, taking account of the varying nature of the districts.
  2. Computerised mapping capacity is essential for conducting a redivision. The Victorian Electoral Commission’s (VEC’s) GIS Team developed new boundary drawing software (Boundary Maker) in-house before the redivision. Boundary Maker (based on a MapInfo platform) provides an efficient and precise tool for drawing boundaries. Geocoded elector address points ensure that individual elector locations and numbers are taken into account, and statistics at SA1 level allow calculations of current and projected electors to be made in great detail. The EBC modelled a multitude of possible boundaries, including each submission’s proposal for each district and region, calculating both current and projected electors.

    Maps of existing districts

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