Following the 2001 federal election, the AEC undertook a survey of the 580 561 informal votes recorded. The informal ballots were aggregated from polling places into divisional and state summaries.
The data has been analysed by the AEC and forms the basis of a report containing, among other things, strategies to reduce the informal vote.
Each divisional table contains the demographic rating used by the AEC:
The enrolled figure is the number of electors enrolled to vote at the 2001 election, compared to the turnout figure which represents the total number of people voting at that division. The figure is expressed both numerically and as a percentage of the enrolled figure.
The Two-Candidate Preferred (TCP) refers to the total number of votes gained by the final two candidates remaining after a full distribution of preferences has occurred.
The informal vote is the total number of informal votes received for the Division and is represented both numerically and as percentage of the total turnout figure. The informal votes are categorised according to the following groupings:
Each divisional table contains the names of the polling places that recorded the highest and lowest percentage of informal papers.
The state summaries are an amalgamation of all the divisional summaries and contain the highest and lowest ranking Divisions in terms of the percentage of informal votes. In addition each state summary contains a graph of the national informal vote and state informal vote since 1901.