Preference Flows And The Eden-Monaro Result

 The much-awaited Eden-Monaro preference flows are finally out, following some time after the distribution of preferences, and it's useful to make some comments about these.  (Also see Antony Green's comments.) 

Labor won the by-election by 735 votes (50.39% 2PP).  This means that had 368 voters who preferenced Kristy McBain instead preferenced Fiona Kotvojs, Kotvojs would have won.  This is relevant for checking various claims about preferences of particular parties deciding the result.  In my Eden-Monaro live thread I set some markers at the time for particular preference shifts causing or not causing the result.  

Did Nationals preference flows weakening cause Labor to win?

Answer: Yes - but this isn't necessarily what it looks like.  In Eden-Monaro in 2019 an unusually strong 87.16% of Nationals preferences flowed to Fiona Kotvojs.  At the 2020 by-election the flow was only 77.73%, making a difference of 571 votes to each side's total, and a difference of double that to the margin.  While it was unrealistic for the very high flow from 2019 to have been maintained, any flow above 81.08% would have resulted in the Liberals winning the seat.  That figure is almost exactly the 2019 national average in contests where the Nationals were excluded, so the switch from an above-average to a below-average Nationals to Liberals preference flow can be said to have cost the Liberals the seat.  

Eden-Monaro Late Live Comments And Post-Count

Eden-Monaro (ALP 0.85%) McBain (ALP) retains with 50.41% 2PP (-0.44)

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Recount?

Some people are speculating about a recount.  A recount is automatic if the final margin lands below 100 votes, but that is now very unlikely.  For margins above this, recount calls are typically rejected.

Nationals And Shooters Preference Factors

There is a lot of speculation about whether Nationals preferences have caused Kotvojs to lose.  Estimates of the Nationals to Liberals preference flow have varied from 70% to nearly 90%.  Scrutineering of this flow across a large electorate is extremely difficult; it's best to wait until the AEC comes out with the final preference flow.

On figures current as of Tuesday morning, McBain leads by 775 and there are 5924 Nationals votes.  This means that unless the flow from the Nationals to Kotvojs exceeds 93.5%, Kotvojs would be now leading had she got every Nationals preference.  But that's not interesting, because 100% preference flows never occur and the Nationals running is not the cause of the "leakers" preferencing Labor (most would have done so anyway).  What is interesting is whether the flow has weakened since 2019 and done so by enough that the weakening of the flow becomes the cause of Kotvojs' defeat.  At the moment this is the case if the flow from the Nationals has shifted to below 80.7%.

Another question is whether the Shooters preferences have caused the outcome.  Estimates of the Shooters flow vary with some claims as high as two to one to Labor, but Liberal scrutineers have said 50-50.  As of Tuesday morning, for Shooters preferences to have alone determined the outcome, they would have to break 57.8% to Labor.  However, the flow of Shooters preferences to Labor will be boosted by the donkey vote, meaning that if even, say, 55% of genuine Shooters voters have preferenced Labor then that will have decided the seat.  For the Shooters how to vote card to have decided the seat, it would currently have to be the case that the flow from the Shooters (whatever it is) would have been 15.7 points weaker had the Shooters preferenced the other way.  Limited evidence does not support Shooters how to vote cards making that much difference.  This number may drop with further counting, but I'm not sure that it will.

A further possibility is that some combination of Shooters preferences and weakening in the Nationals flow could account for the result, with neither factor decisive by itself.

I will analyse preference flows fully when they are available.

Count Updates - comments scroll to top below the line

Eden-Monaro By-Election 2020: How Loseable Is It?

EDEN-MONARO (NSW, ALP 0.85%)
By-election July 4th
Cause of by-election: resignation (citing health reasons) of Mike Kelly (ALP)
Outlook: It's a weird one, and so anything could happen.  For what it's worth, historical patterns slightly favour Labor.

Welcome to my pre-analysis page for the Eden-Monaro by-election.  I expect to have a live page on election night, but starting late (say 8 pm) because of a clash with something else.

There are two main narratives about this by-election as the parties compete for the role of underdog and try to manage expectations in advance.  The first is that the loss of an opposition seat to an incumbent government in a federal by-election is literally a once in a century event (it happened for the only time in 1920) and that therefore a government win is unrealistic.  The second is that the seat's marginal nature combined with the high personal vote of outgoing ALP incumbent Mike Kelly makes the seat extremely difficult to defend in the current environment.  I argue here that both these narratives are wrong.   The by-election is much more loseable than the "100 years" history suggests, but all of the arguments as to why it could be lost have at times been overplayed.

If you want a go at picking the outcome yourself, there's a Not-A-Poll in the sidebar, running until polls close.  (As of 4 pm 4 July, the average forecast on this site was 50.89% to Labor, ie zero swing, with one voter predicting a non-major party winner. This site's reader base skews fairly heavily to the left.)