Pre-election pendulum for the Queensland state election, 2015

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The following is a Mackerras pendulum prior to the Queensland state election, 2015 .

The Mackerras pendulum was devised by the Australian psephologist Malcolm Mackerras as a way of predicting the outcome of an election contested between two major parties in a Westminster style lower house legislature such as the Australian House of Representatives, which is composed of single-member electorates and which uses a preferential voting system such as a Condorcet method or IRV.

"Very safe" seats require a swing of more than 20 points to change, "safe" seats 10–20 points to change, "fairly safe" seats 6–10 points, and "marginal" seats less than 6 points.

The following Mackerras Pendulum worked by lining up all of the seats according to the percentage point margin post-election on a two-candidate-preferred basis. [1] Following the 2012 election, Ray Hopper left the LNP to lead Katter's Australian Party while two further LNP MPs became independents (Carl Judge in the electorate of Yeerongpilly and Dr Alex Douglas in the electorate of Gaven), resulting in a total of 75 LNP seats, seven Labor seats, three Katter seats and four independent seats. By-elections in Redcliffe and Stafford saw Labor defeat the LNP, reducing the LNP to 73 seats with Labor on 9 seats.

A percentage point or percent point is the unit for the arithmetic difference of two percentages. For example, moving up from 40% to 44% is a 4 percentage point increase, but is a 10 percent increase in what is being measured. In the literature, the percentage point unit is usually either written out, or abbreviated as pp or p.p. to avoid ambiguity. After the first occurrence, some writers abbreviate by using just "point" or "points".

Two-party-preferred vote

In Australian politics, the two-party-preferred vote is the result of an election or opinion poll after preferences have been distributed to the highest two candidates, who in some cases can be independents. For the purposes of TPP, the Liberal/National Coalition is usually considered a single party, with Labor being the other major party. Typically the TPP is expressed as the percentages of votes attracted by each of the two major parties, e.g. "Coalition 45%, Labor 55%", where the values include both primary votes and preferences. The TPP is an indicator of how much swing has been attained/is required to change the result, taking into consideration preferences, which may have a significant effect on the result.

Electoral district of Yeerongpilly state electoral district of Queensland, Australia

Yeerongpilly was a Legislative Assembly electorate the state of Queensland. Named for the suburb with the same name, the electorate was renamed before the 2001 elections from the previous name of Yeronga. In 2017, it was abolished and replaced by the electoral district of Miller.

Liberal National seats
Marginal
Bulimba Aaron Dillaway LNP0.1 points
Maryborough Anne Maddern LNP0.3 points v IND
Waterford Mike Latter LNP1.0 point
Lytton Neil Symes LNP1.6 points
Greenslopes Ian Kaye LNP2.5 points
Sandgate Kerry Millard LNP2.9 points
Nudgee Jason Woodforth LNP3.1 points
Cook David Kempton LNP3.4 points
Capalaba Steve Davies LNP3.7 points
Ipswich Ian Berry LNP4.2 points
Logan Michael Pucci LNP4.8 points
Townsville Robert Cavallucci LNP4.8 points
Brisbane Central John Hathaway LNP4.9 points
Mount Coot-tha Saxon Rice LNP5.4 points
Morayfield Darren Grimwade LNP5.6 points
Ashgrove Campbell Newman LNP5.7 points
Fairly safe
Keppel Bruce Young LNP6.4 points
Thuringowa Sam Cox LNP6.7 points
Ipswich West Sean Choat LNP7.2 points
Cairns Gavin King LNP8.9 points
Nanango Deb Frecklington LNP9.0 points v KAP
Algester Anthony Shorten LNP9.1 points
Barron River Michael Trout LNP9.5 points
Ferny Grove Dale Shuttleworth LNP9.5 points
Murrumba Reg Gulley LNP9.5 points
Stretton Freya Ostapovitch LNP9.6 points
Toowoomba North Trevor Watts LNP9.6 points
Safe
Mundingburra David Crisafulli LNP10.2 points
Sunnybank Mark Stewart LNP10.2 points
Whitsunday Jason Costigan LNP10.7 points
Burleigh Michael Hart LNP11.0 points
Mansfield Ian Walker LNP11.1 points
Mirani Ted Malone LNP11.2 points
Broadwater Verity Barton LNP11.3 points
Albert Mark Boothman LNP11.9 points
Pumicestone Lisa France LNP12.1 points
Kallangur Trevor Ruthenberg LNP12.4 points
Everton Tim Mander LNP13.2 points
Callide Jeff Seeney LNP13.5 points v KAP
Pine Rivers Seath Holswich LNP13.7 points
Chatsworth Steve Minnikin LNP14.1 points
Southport Rob Molhoek LNP14.7 points
Springwod John Grant LNP15.4 points
Mount Ommaney Tarnya Smith LNP16.5 points
Gympie David Gibson LNP16.5 points v KAP
Burdekin Rosemary Menkens LNP17.4 points
Burnett Stephen Bennett LNP17.4 points
Cleveland Mark Robinson LNP18.1 points
Bundaberg Jack Dempsey LNP18.2 points
Lockyer Ian Rickuss LNP18.8 points
Indooroopilly Scott Emerson LNP19.5 points
Hinchinbrook Andrew Cripps LNP18.9 points
Very safe
Condamine VacantLNP20.1 points v KAP
Currumbin Jann Stuckey LNP20.2 points
Glass House Andrew Poweell LNP20.4 points
Clayfield Tim Nicholls LNP20.6 points
Maroochydore Fiona Simpson LNP20.9 points
Redlands Peter Dowling LNP21.1 points
Caloundra Mark McArdle LNP21.2 points
Toowoomba South John McVeigh LNP21.6 points
Aspley Tracy Davis LNP21.7 points
Hervey Bay Ted Sorensen LNP21.7 points
Beaudesert Jon Krause LNP22.3 points
Coomera Michael Crandon LNP23.3 points
Moggill Bruce Flegg LNP23.9 points
Gregory Vaughan Johnson LNP25.5 points
Noosa Glen Elmes LNP25.5 points v GRN
Mudgeeraba Ros Bates LNP25.9 points
Buderim Steve Dickson LNP26.0 points
Mermaid Beach Ray Stevens LNP26.0 points
Kawana Jarrod Bleijie LNP26.3 points
Warrego Howard Hobbs LNP28.1 points
Surfers Paradise John-Paul Langbroek LNP29.5 points
Extremely safe
Southern Downs Lawrence Springborg LNP30.4 points
Labor seats
Marginal
Mackay Tim Mulherin ALP0.5 point
Mulgrave Curtis Pitt ALP1.1 points
Bundamba Jo-Ann Miller ALP1.8 points
Rockhampton Bill Byrne ALP3.9 points
South Brisbane Jackie Trad ALP4.7 points
Woodridge Desley Scott ALP5.8 points
Fairly safe
Inala Annastacia Palaszczuk ALP6.9 points
Redcliffe Yvette D'Ath ALP7.1 points
Safe
Stafford Dr Anthony Lynham ALP12.0 points
CROSS BENCH SEATS
Yeerongpilly Carl Judge IND1.4 points
Nicklin Peter Wellington IND4.9 points
Mount Isa Rob Katter KAP10.0 points v LNP
Gladstone Liz Cunningham IND14.0 points v ALP
Dalrymple Shane Knuth KAP15.2 points v LNP
Gaven Dr Alex Douglas IND19.1 points v ALP

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The following is a pendulum based on the outcome of the 2010 federal election and changes since, including the redistributions of seats in South Australia and Victoria. It is a Mackerras Pendulum, invented by psephologist Malcolm Mackerras, which works by lining up all of the seats held in Parliament according to the percentage point margin on a two-candidate-preferred basis. The two-party result is also known as the swing required for the seat to change hands. Given a uniform swing to the opposition or government parties in an election, the number of seats that change hands can be predicted. Swings are never uniform, but in practice variations of swing among the Australian states usually tend to cancel each other out. Seats are arranged in safeness categories according to the Australian Electoral Commission's (AEC) classification of safeness. "Safe" seats require a swing of over 10 per cent to change, "fairly safe" seats require a swing of between 6 and 10 per cent, while "marginal" seats require a swing of less than 6 per cent. The swings for South Australian and Victorian seats are notional, based on calculations by the AEC.

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References

  1. Green, Antony. "Pendulum - Queensland Election 2015". ABC News . Australia. Retrieved 25 January 2015.