Australia - 7 September 2013 (user search)
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BigSkyBob
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« on: February 02, 2013, 01:41:52 AM »

BREAKING NEWS: Craig Thomson, Labor-turned-Independent member for Dobell, has been arrested for 149 fraud charges.

Read more here: http://www.skynews.com.au/topstories/article.aspx?id=841104

It's as if Gilliard knew her government was about to fall, so set an election date as well into the future as possible.
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BigSkyBob
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« Reply #1 on: September 04, 2013, 05:51:51 PM »



Predictions are judged as predictions, not statements of fact. In general, possible outcomes are modeled on a bell curve. Mathematically, if 97-50-3 has some probability of occurring you simply cannot label his prediction "wrong."  All you can say is that 97-50-3 way to the Coalition side of the bell curve distribution by your analysis.  Maybe, 97-50-3 is a two-, three-, or four-sigma event by conventional analysis. Then again, the recent victory of the Liberal party in British Columbia was modeled as a three-, or possibly four-, sigma event.  For you to imply that a 97-50-3 is an infinite-sigma event is, I suspect, simply wrong.

A fortnight, or so, after the election night we shall all see whose predictions turned out to more prescient than the others.

I would end by asking who is to really know whether those that predicted a BC Liberal victory were particularly astute political analysts or partisan Grit hacks putting their hearts before their heads?  Every Sunday somebody wins the football pool. Someone is going to win this contest. In hindsight, it will be because they correctly called the tossups  and/or they predicted the right "upsets."  Whether that was a matter of skill or dumb luck we'll never know. Personally, I'm in the camp of recognizing that what we don't know what we don't know. One of the things we simply don't know is who is going to win a number of close contests on Saturday.
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BigSkyBob
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Posts: 2,531


« Reply #2 on: September 05, 2013, 09:54:11 AM »


Predictions are judged as predictions, not statements of fact. In general, possible outcomes are modeled on a bell curve. Mathematically, if 97-50-3 has some probability of occurring you simply cannot label his prediction "wrong

Hate to interrupt the conversation, but lay off Polnut and recall that sampling bias is a thing. The rest of that post is skeptic claptrap I had thought Fivethirtyeight had quashed well...

First of all, I am not particularly impressed with your opinion of the merits or demerits of some unstated argument by some sports prognosticator. If you think his arguments actually have some merit by all means share them.

It is not "skeptic claptrap" that another mathematical model of the British Columbia election showed a BC Liberal popular vote and seat majorities being something on the order of three- and two-sigma events respectively with the actual comfortable margins being achieved even more highly improbable.  Is it really "skeptic claptrap" to point out this objective fact because a four-sigma event just happened by chance, or was it the underlying model itself that was the "claptrap?"

Blaming "sampling bias" makes no sense. It is akin to arguing, "My model wouldn't have garbage out if it didn't have garbage in."  It would seem immediately obvious that if you want to model the variability of an election result that projection would model the variability of the sampling. Obviously, some hand-waving occurred. Turns out that the simplifying assumptions resulted in the model being simplistic.  That is just the objective fact, unless you want to argue sometimes lightening stricks the same person twice in one year.  

Another assumption in such models is that what happens during the balance of the election doesn't matter. Apparently, prognosticators can't model last-minute doubts about the Labor defeating John Majors, or the BC NDP returning to power after their previous stint, so they assume such events don't occur. Again, their models are counter-factual.

The person who has to "lay off" someone is Polnut. His formulation has every indication of him speaking ex cathedra when he is simply in no position to do so whatsoever.
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