preference flows

The Political Impact of Optional Preferential Voting – NSW 2019 Preference Flows

As mentioned in my previous post, New South Wales is the only Australian jurisdiction that uses optional rather than compulsory or full preferential voting for single member lower house elections. It is also the only state that data enters all lower house ballot papers and publishes the data for outside research.

Optional preferential voting (OPV) means that voters do not have to number a preference for every candidate on the ballot paper. A ballot paper requires only a first preference to be formal. All further preferences are optional.

If during the distribution of preferences, a ballot paper for distribution has no preference for a candidate remaining in the count, the the ballot paper is put aside as having “exhausted” its preferences. Exhausted ballot papers have no direct involvement in determining the winning candidate, but they have an indirect role in altering the winning post a candidate must pass to win. As explained below, OPV works in favour of leading candidates over trailing candidates.

This can be explained by comparing the maths of full versus optional preferential voting.

  • Under full preferential voting, the winning candidate must achieve 50% of the formal vote after the distribution of preferences. The winning post of the votes needed to win is set at the start of the count and does not change.
  • Under optional preferential voting, the winning candidate must receive a majority of the votes remaining in the count, that is the formal vote minus exhausted preferences. The winning post is lowered with each exhausted preference making it easier for the leading candidate to win by making it harder for the second placed candidate to catch and pass the leader.

The chart below shows the two-party preferred preference flows for minor parties and Independents at the 2019 NSW election.

I'll explain the political implications of the above graph inside the post. But if you want more detail of the preferences flows by electorate by candidate, or by party by electorate, you can find all the details in this pdf document I've prepared.
Read More »The Political Impact of Optional Preferential Voting – NSW 2019 Preference Flows

SA Election Preference Recommendations

A unique feature of South Australian elections is that registered how-to-vote material for lower house seats is displayed in front of voters in the partitions where votes are completed. I explained how this works in a previous post.

These preference sheets have been released for use in pre-poll voting. Below I summarise the preference recommendations in important seats.

You can find the how-to-votes for each district on the Electoral Commission SA website.

I’ve also published the Legislative Council recommendations. The posters for these are displayed in polling places but not placed inside the voting partition. You can find the Legislative Council tickets on my ABC election site and I hope to publish more on the LC preferences later this week. Some information on how the 2018 preference count unfolded is included in my Legislative Council Preview, again on the ABC site.

The problems for most minor political parties is a lack of volunteers to hand out how-to-vote material outside polling places. This disadvantage is lessened in South Australia by the display of the how-to-vote recommendations.

For instance, Family First for many years issued how-to-votes with preferences to Labor candidates in a small number of seats, mainly those associated with the conservative SDA union. Preferences in these seats were more likely to flow to Labor rather than the Liberal Party. It was a difference in preference flows rarely seen at Federal elections where influencing voters with how-to-vote relies on volunteers handing them to voters.

Family First was absorbed by the Australian Conservatives for the 2018 South Australian election, but continued with the practice of favouring selected Labor candidates with preference recommendations. In 26 seats Conservative preferences were recommended to the Liberal Party and flowed 77% in that direction. The five seats favouring Labor split evenly, only 51.5% to the Liberal Party, and the two seats with split how-to-votes flowed only 67% to the Liberal Party. They are remarkable differences in preference flows compared to flows at Federal elections.

Here’s the preference recommendation summary in key seats.
Read More »SA Election Preference Recommendations

Minor Party Preference Flows at the 2020 Queensland Election

(Note: This post was originally published on 1 November but has been fully updated on 18 November to include data available from later data files. I have also published further comments on preferences, in my final analysis of the 2020 Queensland election results.)

The Electoral Commission Queensland collected preference flow data by candidate as part of its election night count, and continued with the tallying in some electorates in the days that followed..

Preference flow data tallies votes by pairings of ‘from’ and ‘to’ candidates. So in the table below of two-party preferred preference flows, the tally is of votes from third parties that flowed as preferences to Labor or Liberal candidates.Read More »Minor Party Preference Flows at the 2020 Queensland Election

Preference Flows at the 2018 South Australian Election and the Influence of How-to-Votes

The 2018 South Australian election saw a record vote for minor parties. This was largely due to the campaign by Nick Xenophon and his SA-Best party, polling 14.2% in the House of Assembly, a creditable 18.4% in the 26 seats it contested. The failure of the party to poll as strongly as published polling well out from the election suggested, or to elect a member to the Assembly, saw its campaign labelled a failure by political commentators.

In the end the party was used by voters as a conduit for preferences to the Liberal and Labor Parties. As you would expect for a party viewed by voters as sitting in the political centre, the party’s preferences split evenly, 51.6% to the Liberal Party and 48.4% to labor.

The release of preference flow data by the SA Electoral Commission provides an opportunity to analyse preference flows against party preference recommendations. Several unique features in the conduct of SA House of Assembly elections allows the comparison of preference flows with how-to-votes lodged by candidates and displayed in voting compartments.Read More »Preference Flows at the 2018 South Australian Election and the Influence of How-to-Votes

Preference Flows at the 2019 Federal Election

The 2019 House of Representatives election saw a record vote for minor parties, and as a consequence, a record number of seats where preferences needed to be distributed.

As has been the case for three decades, the Labor Party benefited most from preferences, both in flows of preferences and in seats won from second place. But matching the decline in Labor’s first preference support in 2019, preference flows to Labor were weaker than at any election since 2001.

As in the past, Green preferences overwhelmingly favoured Labor, though it was a different story with other parties. The United Australia Party and Pauline Hanson’s One Nation polled 6.5% between them, but where previously preferences flows from both parties had only weakly favoured the Coalition, in 2019 voters for both parties had a clearer preference for the Coalition over Labor.
Read More »Preference Flows at the 2019 Federal Election