Feeds:
Posts
Comments

Posts Tagged ‘2014 NZ General Election’

Last night I published a Google Docs spreadsheet with a number of predictions for the 2014 Election.  Now the results are in I have updated it, and also added a few more sets of predictions from The RuminatorBen Kluge (@benkluge), and Grumpollie; and added the last single poll predictions from the various media outlets on the advice of Thomas Lumley.

On the advice of Thomas I have also adjusted the “number polled”, which is used to calculate the standard errors, from 1000 to 400, which gives an average chi-squared value of about 12.5 for 9 degrees of freedom (not too far off from what we would expect) and roughly agrees with Thomas’ estimate of 2 for the poll-to-poll variation.

We can then use the chi-squared values in column E to give a measure of how close each prediction was to the actual results.  I was a bit surprised to come out in first place amongst the pundits (chi-squared = 4.5), ahead of Gavin White (5.1) and Bryce Edwards (6.1).  David Cunliffe (5.3) is technically in 3rd spot, but I’m not going to count that because he left a lot of blanks in his predictions which I just filled in based on a scaled average of everybody else’s guesses, as explained yesterday.  The top performing poll-of-polls was William Bowe’s (5.8), followed by David Farrar’s Kiwiblog Weighted Averages (5.9).  A handful of pundits and polls-of-polls actually lost out to the 2011 Election results (chi-squared = 10.5), which is a bit of a surprise, but perhaps goes to show what an uneventful three years it has been for the major NZ political parties!

The average prediction in the table was about as useful as a randomly-sampled poll of about 290 people, which might not sound particularly good, but keep in mind that the performance of the average poll (typically with a sample size of about 900-or-so) was only about as useful as a randomly-sampled poll of about 260 people.

The only other point of note: even after (generously) rounding up the results to account for special votes every single one of the 23 predictions in the table will still have over-estimated the votes the Greens would win.  And for many that would be after correcting for the Greens under-performing relative to the polls at the last election.  Nobody on Twitter seems to have a credible explanation for why this happened.

Read Full Post »

Punditry Is Fundamentally Useless – Nate Silver

A few people on Twitter and elsewhere have been making pre-election predictions for tonights results, so I thought it would be handy to have them all in one place so we can see how everybody performed.  I have created a Google Docs spreadsheet with everybody’s guesses.  Please feel free to download a copy and/or share it as you wish.

Fist things first: I made a previous reckons on Twitter, but I left out the “other” numbers, which I think will be quite high this year, so my updated predictions are as follows.

  • National 47.40%
  • Labour 25.70%
  • Green 12.00%
  • NZ First 7.00%
  • CCCP 3.50%
  • IMP 1.50%
  • Maori 1.20%
  • ACT 0.70%
  • United Future 0.20%
  • All other 0.80%

Not everybody in the spreadsheet made a full set of predictions; if there were results missing for any parties I simply took the averages of everybody else who made a prediction for those parties and scaled them so that the total numbers would add up to 100%.

The variance in the predictions is about what we expect if they were taken from a set of different polls with 1000-or-so respondents, so that number is in the spreadsheet at the top in cell B2.  This number is then used to calculate a “standard error” for each prediction (columns O-X) and measure how far off the actual results each prediction was (columns Y-AH).  These are then summed to get a Chi-squared value (NDF = 9), which is shown in column C.  This gives a measure of how close each prediction was to the actual results.

I will update the sheet when results are finalised.  In the mean time, if you know of anybody who has made a public prediction of the results that isn’t included please hit me up in the comments or on Twitter.

Read Full Post »

Following on from previous posts, another short update on the iPredict stocks for National and Labour to win the 2014 election.

Daily average trade prices for National broke through the 80c barrier on 26 June, and Labour went below 20c on the same day.  The prices were reasonably stable around those levels for about six weeks until 13 August 2014 when the Dirty Politics scandal broke and National took a steep hit.  Average daily prices for National were below 70c for several days, and bottomed out at about 64c on 22 August, well before Collins’ resignation on 30 August.  The stocks have since rebounded, with National today trading for around 84c, an all-time high.

While there was obvious movement, most likely attributable to fear over the fallout from the Dirty Politics scandal, it was short lived.  As mentioned in the previous post the clock is running out for Labour, which needs to find some sort of game-changer, and there is less and less time left before the election for them to do so.

Graph of prices below:

Daily average trade price, 2014 election winner stocks on iPredict for National (blue) and Labour (red).

Daily average trade price, 2014 election winner stocks on iPredict for National (blue) and Labour (red).

Since Dirty Politics was released trading volumes and volatility are up significantly. During the last month there have been over 7,100 trades (National and Labour combined), and total volume was over 115,000.  Since opening on 26 October 2011 the total volumes traded are about 195,000 for National and 173,000 for Labour, so almost 1/3 of total volume traded in the last 3 years has been in the last month.  The stocks definitely aren’t moving about on small volumes.

Weekly volume, 2014 National election victory stock on iPredict.

Weekly volume, 2014 National election victory stock on iPredict.

Weekly volatility, 2014 National election victory stock on iPredict.

Weekly volatility, 2014 National election victory stock on iPredict.

The consensus seems to be that this isn’t going to be a particularly close election.

Read Full Post »

Following on from previous posts, another short update on the iPredict stocks for National winning the 2014 election.

Daily average trade prices for National have trended up towards 80c, and Labour down toward 20c.  Prices are as follows:

Daily average trade price, 2014 election winner stocks on iPredict for National (blue) and Labour (red).

Daily average trade price, 2014 election winner stocks on iPredict for National (blue) and Labour (red).

Daily average trade price, 2014 election winner stocks on iPredict for National (blue) and Labour (red).

Daily average trade price, 2014 election winner stocks on iPredict for National (blue) and Labour (red).

You can see that the prices for National stabalised just above 70c in April and May after earlier peaking at around 76c in mid-March.  I don’t believe that any single event has caused the prices to move.  It’s more a case of running out the clock; Labour needs some sort of game-changer, and there is less and less time left before the election for them to find one.

Weekly trade volumes are up, and now amount to about 1600 shares per week, or $1100 per week.

Daily volume, 2014 National election victory stock on iPredict.

Weekly volume, 2014 National election victory stock on iPredict.

Read Full Post »

Following on from previous posts, another update on the iPredict stocks for National winning the 2014 election.

Daily average trade prices are as follows:

Average daily trade price, 2014 election winner stocks on iPredict for National (blue) and Labour (red).

Daily average trade price, 2014 election winner stocks on iPredict for National (blue) and Labour (red).

And zoomed in on the last nine months, starting just before Shearer resigned as leader:

Average daily trade price, 2014 election winner stocks on iPredict for National (blue) and Labour (red).

Daily average trade price, 2014 election winner stocks on iPredict for National (blue) and Labour (red).

After topping out at $0.78 on 28 March prices for NATIONAL have stabalised in the low 70% range.

Things have not really gotten better for Labour, with the split now fairly stable at 70/30 odds over the last month.  The book is still a little asymmetrical, stronger on the bid side than the ask side, although there is a bit more room for the price to move around than there was previously.

I still think National’s chances to win are priced a little high, but at 70% it’s close enough that I’m not going to bother throwing money at it to try and fix it.

Read Full Post »

By popular request: an update of the previous post with data from the last eight days.

Average daily trade price, 2014 election winner stocks on iPredict for National (blue) and Labour (red).

Average daily trade price, 2014 election winner stocks on iPredict for National (blue) and Labour (red).

And zoomed in on the last seven months beginning on 20 August, just before David Shearer resigned:

Average daily trade price, 2014 election winner stocks on iPredict for National (blue) and Labour (red).

Average daily trade price, 2014 election winner stocks on iPredict for National (blue) and Labour (red).

Things have not got better for Labour, with the split now fairly stable at 70/30 odds over the last week.  What is worse is that the book is very asymmetrical: to short National’s chances of victory down to 60% you would need to drop $1813, whereas to bid them up to 80% would take only $553.  Everybody seems particularly bullish on National’s chances.

To be honest I’m a bit surprised.  In the previous post I said that I don’t see how the stock for National can realistically go higher than 70c prior to the pre-election leaders’ debates, and I stand by that.  I’m not sure why people keep bidding the stock up past 70c, although profit taking could be part of it.  I’ve left a few out of the money asks, but am starting to get a bit over-exposed.

Read Full Post »

iPredict is running a contract on National winning the 2014 election.  It was originally launched on 26 October 2011, a month before the 2011 General Election, and has been floating around between $0.40 and $0.60 since then.  It’s only in the last month that the stock has moved significantly beyond $0.60, so it’s worth taking a quick look.  Full trade history is taken from Luke Howison’s excellent API interface for iPredict, and then tweaked with a bit of Excel.

As shown in the graph below, the increase in price since has been pretty constant since it was trading at about $0.45 in October 2013, about a month or so after David Cunliffe was elected leader of the Labour Party.  The average daily price hasn’t dropped below $0.60 since 8 February 2014.

Average daily trade price, 2014 National election victory stock on iPredict.

Average daily trade price, 2014 National election victory stock on iPredict.

In  case you are wondering if this is just a short term fluctuation the answer is probably not.  Daily volumes are shown below.

Daily volume, 2014 National election victory stock on iPredict.

Daily volume, 2014 National election victory stock on iPredict.

Even disregarding the spikes you can still see that trading has increased quite a bit since, again, about mid-October.  In that four month period a total of $19200 changed hands, or about 42% of the $46100 total that has been traded since 2011.  The stock is not just bouncing around on weak liquidity.

It should also be mentioned that bid order book is quite solid: if you wanted to force the evaluation of National’s chances of winning the election back to an even 50/50 then you would need to drop a total of $1420 on 2500 contracts at an average price of $0.57.  Then you’d have to keep it there.  It’s doable, but I don’t fancy your chances.

Intra-day volatility is shown below:

Intra-day volatility, 2014 National election victory stock on iPredict.

Intra-day volatility, 2014 National election victory stock on iPredict.

The most volatile days were 28 January 2014 (David Cunliffe’s State of the Nation speech and “baby bonus”, the new flag debate), 26 October 2011 (contract launch, so meta), 28 November 2011 (first weekday after 2011 General Election), 28 October 2011, and 11 October 2012 (opposition parties’ discussion on “manufacturing jobs crisis” and Labour allegations a video exists of John Key talking to GCSB staff in February about their involvement in the Kim Dotcom case), although most on small volumes.

Daily changes are as follows:

Daily price change, 2014 National election victory stock on iPredict.

Daily price change, 2014 National election victory stock on iPredict.

The biggest absolute daily changes (other than those mentioned above) were 29 April 2012 (general debate over whether David Shearer was the correct choice for Labour Leader (see Dim-Post) and the Banks/Dotcom scandal), 22 April 2012 (a series of bad headlines for National, none of which seemed to have any affect on the polls), 13 October 2012 (“manufacturing jobs crisis”, although interestingly also the day before the MSD/WINZ security leaks exposed by Keith Ng hit the headlines?).

The 28 January 2014 in particular was an interesting day: on the day David Cunliffe was giving his State of the Nation/Baby Bonus speech stocks surged 6.6c from 59.8c to 66.4c on near-record volumes as over $1300 changed hands.  Was this the beginning of the end for Labour’s 2014 election chances?

Finally, this is the point where I’m obliged to point out that if you really think that iPredict has a pro-National bias, and that National actually have a less than a 65% chance of winning the election then you should put your money where your mouth is and go and short some stock.  There is plenty of liquidity there for you to bail out should your views change so you won’t be locked into your position long-term; you can’t use that as an excuse either.

For what it’s worth, I personally I think that barring 4-5 good poll results for Labour the stocks are going to settle at around 65c for the next few months.  I don’t see how they can realistically go higher than 70c prior to the pre-election leaders’ debates.  Having said that, I don’t think one or two good poll results for Labour are going to be enough to move them in the opposite direction either.  Labour’s prospects are looking genuinely shabby compared to four months ago (post Cunliffe election), or even 12 months ago when Shearer was still leader.

Read Full Post »