SYDNEY, AUSTRALIA - SEPTEMBER 20: Cody Walker of the Rabbitohs celebrates scoring a try with Dane Gagai of the Rabbitohs during the NRL Semi Final match between the South Sydney Rabbitohs and the Manly Sea Eagles at ANZ Stadium on September 20, 2019 in Sydney, Australia. (Photo by Mark Metcalfe/Getty Images)

The Numerical Advantage: 2020 Finals Predictions

Starting Round 11 last season, this column predicted the winner in 62.83% of games using the data from the first 10 rounds, including predicting both Grand Finalists and the Premiers! How will we go in 2020 using only last season’s data to guide us… 

Last year’s experiment in predicting the rest of the season’s outcomes using the data from the first 10 rounds certainly exceeded my expectations. If I was a smart man I would probably walk off into the sunset and rest on those achievements for remainder of my days.

But I’m just not that smart. I can’t help but wonder… can we do it for the whole season? Can we predict the Grand Finalists before the first Kick Off? Can we crack the 70% accuracy mark… surely with just a few tweaks to the formula…. Damn it, I have to know! So here we go again ladies and gentlemen, your data driven predictions for the 2020 NRL season.

Factors

Last year’s predictions used a fairly rudimentary calculation to score each team for each game with the team with the higher score predicted as the winner. This was based on ladder position, opponent ladder position & home field advantage. This was successful 62.83% of the time, but this year we are going for 70% accuracy and we don’t have the benefit of 10 rounds of form to make our predictions. To create a more comprehensive system we need to consider what really matters in determining a winner.

Is playing at home still an advantage?

Home field is no longer the great advantage it once was. Back in 2000, home teams won a whopping 65% of games, basically two out of every three. In recent times with teams sharing venues, playing at neutral venues for cash and the improved travelling conditions as the game has become yet more professional, this rate dropped as low as 53% in 2015, improving to 56.25% in 2019 – still well down from the turn of the century success rates. Over the last 5 years it is 55.27%. Nine teams in the past 5 years have missed the finals despite finishing with a winning home record.

One of the key learnings from our last attempt is that home team success, 67.44% after 10 rounds, came back to the pack over the course of the season 56.25%. Whereas last year home field was worth 4 point in the calculations, this years will be scored with 3 points for a home game or a 1.5 point score for the listed home team at a neutral venue.

Note that the Roosters games all around Sydney are not included as neutral in this as there is minimal travel for them so they are not disrupted in the manner they will be when travelling to Perth in rd. 11 for their ‘home’ game against the Raiders. Sharks home games are at Jubilee.

Significant home games at Neutral venues
Roosters (H) v Manly (A) – Central Cost Stadium, Central Coast
Raiders (H) v Knights (A) – McDonalds Park, Wagga Wagga
Eels (H) v Broncos (A) – TIO Stadium, Darwin
Tigers (H) V Raiders (A) – Scully Park, Tamworth
Panthers (H) v Sharks (A) – Carrington Park, Bathurst
Sharks (H) v Cowboys (A) – Sunshine Coast Stadium, Sunshine Coast
Sea Eagles (H) v Tigers (A) – Central Coast Stadium, Central Coast
Roosters (H) v Raiders (A) – HBF Park, Perth
Rabbitohs (H) v Raiders (A) – Central Coast Stadium, Central Coast

Magic Round

Once again the Broncos have somehow scored an away game at SunCorp for Magic Round, while Wests, Manly, Souths, Canberra, Roosters, Warriors, Melbourne & the Titans have given up a home game. While this weekend is terrific for the promotion of the game, it will result in a deduction off the home score for each of these faux ‘home’ teams.

The effect of short turnarounds

Was there a correlation between the amount of days between games and the results last year? The following table presents the winning % for each team based on their turnaround from their previous game in 2019.

DaysWinning %
536.00
651.30
753.01
850.70
939.29
1041.67
110.00
1260.00
13 plus52.38

*note: there was only one 11 day turnaround, which was a loss.

In 2019 Short turnarounds (5 days) did have a negative effect (36.00%), while interestingly 9 & 10 day turnarounds were also less successful  (39.29% & 41.67%). 6, 7, & 8 day turnarounds were more successful with 12 or more days being the ideal. Taking this into account there will be a negative score attributed to teams coming off a 5, 9 or 10 day turnaround, a positive score for 6,7,8 & 13 days, and a higher score for teams coming off a 12 day layoff.

DaysPoints
5-2
6+1
7+1.5
8+1
9-1
10-1
110
12+2
13 plus+1.5


The Formula

ladder position, +/- home field advantage, +/- turnaround
minus opponent’s ladder position, +/- home field advantage, +/- turnaround

The team with the higher score in each matchup will be our predictive winner.

Predicted Ladder

After applying our formula to every single game for the upcoming season, here is the projection.

PositionTeamWinLoss
1stMelbourne Storm222
2ndSouth Sydney Rabbitohs213
3rdSydney Roosters204
4thCanberra Raiders195
5thParramatta Eels177
6thManly Sea Eagles159
7thCronulla Sharks1410
8thBrisbane Broncos1212
9thPenrith Panthers1014
10thWests Tigers1014
11thCanterbury Bulldogs915
12thNewcastle Knights915
13thNew Zealand Warriors420
14thSt George Dragons420
15thGold Coast Titans321
16thNorth Queensland Cowboys321

 

Now obviously this a projection. This does not take into account injuries, suspensions, coaching changes, etc. This is simply an attempt to develop a formula to predict the season before it kicks off based on last years results, so please keep this in mind when hitting up the comments section. There is not a massive amount of change to the ladder positions from 2019 (poor Cowboys) but no team is projected to finish with their same record as 2019, which was surprising.

Predicted Grand Finalists

Using the same successful formula as last year, where we had the Roosters vs the Raiders as our GF, we know that the Grand Finalists are most likely to be the teams that finish 2nd and 5th. Using this as our guide again our Grand Finalists for 2020 will be the….
Rabbitohs and Eels

Predicted Premiers

With our eventual premiers being… The South Sydney Rabbitohs

So there it is folks. There will be 192 games in the 2020 NRL Regular Season. To get to our 70% benchmark we need to hit on 135 of them. Wish me luck. This should be interesting.

As always, thanks for reading. Comments & thoughts are always welcome in the comments section and best of luck to your club for the upcoming season.

Trust in the Data!

1 COMMENT

  1. I love it!
    Let’s wait for the MultipleNuggetOfDimWood, to start having a fit about that prediction!

  2. MATTHEW FAIRHALL, the one error I picked up on is that the Rabbitohs do play a “HOME” game against the Warriors on the Sunshine Coast in Rd 22…
    You obviously missed this one!

  3. I e said it all along..
    If the Souths Sombreros lose it will be a Dismal failure in a long list of dis al failures and will surely snes Jealous guy over the edge

    Good luck Back to back world champs

  4. A very interesting read, and the formula is well constructed. Clearly a whole bunch of effort went into this. Well done!

  5. Chalky soufths are forever in the Roosters Shadow.
    With only 79 years left in the 21st century. Your grarse eating rabbit is already three premierships, 3 World Club Challenge cups, and 5 Minor Premierships behind the Mighty Sydney Roosters.

    Chalky….Forever In Our Shadow.

  6. There’s statistics and then there’s just plain lies. Roosters will make it a Trifecta. 👌👍

  7. This is just plain rubbish as is the claimed success last year. It is statistical nonsense. Try tossing a coin, the results would be equally valid.

  8. There a four teams that could win this comp.
    Souths/Western Suburbs rabbits with their head office at Nana Glen…..
    Aren’t one of them.😂🤣😂🤣

  9. It doesn’t take into account the poor refereeing decisions. That usually favour the clubs that the referees want to impress , to go further as referees . Or the usually one sided penalty counts , for the same reason.

  10. 3hats March 11, 2020 at 7:29 pm
    ………..one error I picked up on is that the Rabbitohs do play a “HOME” game against the Warriors………

    hahahaha … remind us all where “HOME” is….for Souffs. TweenyONE can’t tell us…

  11. chookstool March 12, 2020 at 10:47 am
    “hahahaha … remind us all where “HOME” is…”

    Ask Latrell 🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣

  12. Souths Sombreros are favourites and it is theirs to lose

    If they are ever lucky enough to win 6 titles in 7 years as well as back to back them they will know the joy we su

    Peters have felt over the last 10 years

    Somehow I don’t believe their toxic divide between the entitled and those the rest will be conducive to matching the Roosters success

    The Roosters have excelled far beyond any other team and all based on Intelligence, comrade rice, heart and soul

    Thank you SYDNEY Roosters for bringing us so much joy
    🏆🏆🏆🏆🏆🏆
    🏉🏉🏉🏉🏉🏉
    🥇🥇🥇🥇🥇🥇

  13. WoodedChookstir..
    There are quite a few of the team that were there even this time last year , have now left. Plus ,Phil Gould doesn’t work there. ( You should really get up to date with the NRL news numbstir ! ). Added to the fact that there was only a 5 year plan to win a premiership , in the sports stories. That was never stated by Gould. ( So you should check your facts yet again! ). I suppose it could be another ordinary season or a little better than that?
    How’s trying to buy more backs going at the Import , No juniors Nuggets going ChookPellets? Since yet another import last week I mean. 👍