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I think my favourite line from the article is this one...So how do you explain our predicted “sharp fall”. We’re gonna be the AFLs biggest sliders... from a lofty 15th, all the way down to 14th!!! Was looking forward to reading about why some abstract formula had us winning the spoon... but they couldnt even substantiate their own headline ffs. Eagles finished 2nd on the ladder and are predicted to be 4th this year... two place drop seems more than our 1 position free fall/spiral/club in crisis. I know it’s based on predicted “W”s, but typical West media crap. It’s so predicable and dependable. Don’t ever change
But the formula has proven itself generally true the last few seasons, predicting 12 of 14 sharp rises and falls (based on an ‘actual’ and ‘predicted’ win/loss difference of 2.5 games) since 2010.
Firstly 2.5 games is a massive margin of error, especially given it is really double that given it could be 2.5 more or 2.5 less - our predicted so called biggest slide in the AFL this season would be within that margin of error. And secondly it is absolute BS. I ran the numbers from 2017 and their expectation was out by more than 2.5 wins for 10 out of 18 clubs. 6 of the teams were out by more than 4 wins (ie more than the difference between 2nd and 12th on the ladder). The only two teams they estimated the correct number of wins for were Brisbane and Essendon. I reckon most people did better than that by just using the ladder predictor. St Kilda were expected to get 10.3 wins according to the algorithm and ended up with just 4
Hawks expected to get just 8.9 wins and ended up with 15. 2016 predictions were no better. 9 out of 18 clubs out by more than 2.5 wins, and again only 2 were correct. Essendon was out by 9 wins, Richmond by 8.5 and North by 6. 6 teams out by more than 4 wins. But in typical journalistic fashion they go back through 10 years of data to selectively pick out 7 examples to fit their narrative.Conclusion: One of the dumbest prediction models I've ever seen. Fox Footy should be embarrassed for referencing it without checking it was accurate. And The West even more embarrassed for assuming Fox Footy actually checks things and just reproducing the BS without a second thought. Points For/Against Percentage provides good guidance for how a team went in a season beyond wins and losses but it is clear it has little bearing on predicting what will happen the following season (other than teams that have a healthy percentage have more chance of doing well the following year - did we really need to apply a standard deviation to figure that common sense thinking out?). Max Laughton (Fox Footy) is an idiot, and whoever at The West wrote their article (who wanted to remain anonymous by the looks) is also an idiot. Leave the math to mathematicians and statistical analysts please 'journalists'.




That's the difference between journalism and credible research. Researchers aren't allowed to pick and choose the bits that fit their narrative. Call it what it is - a pathetic attempt to have a dig.


