Tag Archives: sports

A glance at the NRL with Poseidon ratings

If you read my tips for round 1, you would have seen the Poseidon rating making an appearance. The purpose of the Poseidon rating system is to look at each team’s offensive and defensive capabilities separately, as well as their home and away performance, to see if their winning record is concealing strengths or weaknesses.

The underlying principle is quite simple. We look at how many tries a team scores, at home and away, and how many they conceded, similarly at home and away, and see how that stacks up against the league average over the previous twenty-four rounds.

The league average moves over time. In 2013, the home team scored 3.9 tries on average and the away team 3.2. In 2018, those numbers had changed to 3.6 and 3.1 respectively. While 0.3 tries per game may not seem like much, over a 192 game regular season schedule, that’s 57 tries that have gone missing, or about 316 points, just for the home teams.

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Primer – Poseidon ratings

Poseidon ratings are a new team rating system for both the NRL and the Queensland Cup.

For those who don’t have time to read 2000+ words, here’s the short version: the purpose of Poseidon ratings is to assess the offensive and defensive capabilities of rugby league teams in terms of the number of tries they score and concede against the league average. By using these ratings, we can estimate how many tries will be scored/conceded in specific match ups and then use that, with probability distributions, to calculate an expected score, margin and winning probabilities for the match-up.

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What’s new in 2019

I had meant to do some wrap-up posts after I got back from my honeymoon but it felt like the moment had passed, being two or three weeks after the grand final, and I didn’t have much to say other than the navel gazing stuff that people really don’t care about it.

This tweet sums up the 2018 season on the blog pretty well though:

This post is about some of the stuff that’s changed and what’s a work in progress but mostly to let you know that we are indeed in business in 2019.

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Gauging the 2018 State of Origin teams – Game I

For the first time in a long time, it looks like we may have a well balanced Origin season. Indeed, the balance may even be a little Blue for my liking but when three of the last generation’s four best players retire from representative football, and they all happened to play for the same state, then the scales will shift perceptibly.

By now, you would know who’s playing for both Queensland and New South Wales in the first of rugby league’s three biggest games. You might even have formed an opinion as to which side is looking the goods. Consensus seems to have settled on this being the Blues’ year. But why settle for the thoughts of experts who have spent the last forty-eight hours tweeting out the leaked Blues lineup, when I’ve crunched the numbers for you?

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Which 2018 NRL halves combo is working best?

StatScore, a player rating tool I developed over the off-season, feels like something powerful but I haven’t had a real chance to use it yet. Thanks to Fox League posting individual player stats, I can at least keep updating the scores through 2018 which I was worried I wouldn’t be able to.

But here we are, about one-fifth of the way into the 2018 campaign, and it’s time to start assessing performances. StatScore gives a lot of props to players in the halves, so much so that three of the four top players from the last four seasons have worn the number 7. During the off-season, a lot of the halves shuffled around, including the top line names of Maloney, Cronk, Pearce, Green, Hunt and Marshall. Let’s have a look at how that’s panned out.

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