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Election predictions

Polls are generally snapshots of opinion in the past, but they are often used to try to predict future election results. This can be interesting but accuracy is obviously not guaranteed.

An interesting approach here to New Zealand general election forecasts

This page provides experimental probabilistic predictions for the 2017 New Zealand General Election. It draws on multiple opinion polls, but goes a step beyond a straightforward poll aggregator in that the estimated voting intention from successive polls is used to forecast the chances of each party to actually win seats on election day, taking into account uncertainty. Polling results are also adjusted to take into account different polling firms’ past performance in predicting different parties’ results.

Every election can have it’s own unique pattern of lead-up polling so past trends won’t always predict future trends correctly, but this is as good as predictions can get.

It has some flaws but I expect some of these to be dealt with.

Oddly that doesn’t include a National coalition with NZ First.

What I like about this site is that it shows ranges of probabilities, showing that there is always margin for ‘error’ or inaccuracy.

This shows that a range of outcomes are possible for all parties. I presume it will be refined as we get closer to the election – it will be interesting to compare these predictions with later ones.

The poll results and trends show how volatile the polls have been for Labour, Greens and NZ First.

Perhaps ominously for National their results have been tightening in a downward trend since John Key stepped down, but it’s too soon for poll responses to the budget.

For the term to 2014 National had been trending down but that turned around, but well in advance of the election. They will be hoping for a late upswing this year but there is no sign of that yet.

NZ First have had late and significant upswings for previous elections after dipping mid term, but this term their poll support has held up. It’s difficult to predict whether this pattern will repeat this year or not.

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