Wednesday 21 February 2024

Saints Ahoy - Rugby League Data Visualisation Project 2024

Introduction: After my reasonably successful posts on England at the 2021 World Cup (https://fulltimesportsfan.wordpress.com/2022/12/29/rugby-league-world-cup-2021-final-network-diagram/), I was considering an expanded project. Both the 2021 Rugby League World Cup and the 2023 Rugby Union World Cups (https://fulltimesportsfan.wordpress.com/2023/11/01/the-road-to-explicableness-a-closer-look-at-england-after-their-seventh-world-cup-game/) demonstrated that, understandably, with each extra game, the stronger the data got, and the clearer the shapes of the teams got. 

The effect was stronger for the England rugby league team than the union team because, I think, Shaun Wane didn't have his chosen playmaker suspended for 3/7 games, and because he had a much clearer idea of who his first team were than Steve Borthwick did. 

Taking these two ideas together, I thought, why not follow a rugby league team through their season and see what the data shows? 

My beloved Saints were an obvious choice. 

Then I realised that, while nrl.com has all the information I could possible need, the Super League's website doesn't even have match reports. 

Cue sad me scrabbling for a replacement team, and hitting on St. George Illawarra, who have both a similar name and a similar jersey. They were a decent replacement. 

I was checking in on St. Helens's first game of the season on twitter (https://twitter.com/Saints1890) and realised that the twitter feed normally has most of the information I need. And then I remembered that my beloved Saints use that feed to do the "as it happened" section of their match reports (example from the first match of the year here - https://www.saintsrlfc.com/matches/2024/first-team/saints-v-london-broncos-2024-02-16/) so I don't even need to do it live or almost live. 

I love Saints so much. 

Game 1: 

Saints' first game was against the London Broncos, who were promoted to the Super League at the end of the 2023 season. 

You can read match reports here - https://www.saintsrlfc.com/matches/2024/first-team/saints-v-london-broncos-2024-02-16/ or https://www.bbc.co.uk/sport/rugby-league/68304742 depending if you want "focussed on Saints" or "more evenly interested in both teams". 

I am with the section of fans pleased with the result and performance given it was the first match of the season, but concerned about the number of missed conversions. When Saints play stronger teams, dropping points like that could hurt Saints. 

As London only scored four points, I'm not showing the "players on the pitch when Saints conceded points" diagrams. (Although, from a fan's perspective, well played on defence Saints :) ) 

The "players on the pitch when Saints scored" is already quite interesting after only one game, because you can already see the cluster of players who play lots of minutes and the prop combinations that play together: Dendrogram after the first game.  There is one large group, containing Dodd, Blake, Hurrell, Lomax, Makinson, Sironen, Welsby and Whitley, who were present for all the point-scoring moments.  The only other cluster is Walmsley and Bell, who therefore played together often, suggesting they are one of the prop lines that Saints use together. 

I expected the larger group, didn't expect Bell and Walmsley to be played together that much.  It suggests that they might be one prop pairing.

The paler squares in the next diagram indicate players who weren't on the pitch together when Saints scored, suggesting they don't play together. Matrix diagram, the dark red/purple cluster is odd, Blake, Hurrell, Lomax, Makinson, Sironen, Welsby and Whitley.  Walmsley and Bell both have very pale squares for Wingfield and Matautia, who will have to forgive me for not being able to put apostrophes in alt text for technical reasons.  This suggests that Wingfield and Matautia are the other prop line.  Percival has a lighter line than those around him because he was taken off early. From this it looks like Walmsley and Bell didn't play at the same time as Wingfield and Mata'utia, suggesting Wingfield and Mata'utia are the other prop line. Percival has a lighter line than those around him because he was taken off early. I am entirely on team "wrap him in cotton wool once the match is won". 

The network diagram already shows 13 players who play together when Saints score.  They wouldn't be a bad first 13: Network diagram only shows 13 players, they are Bell, Whitley, Hurrell, Delaney, Makinson, Lomax, Sironen, Dodd, Clark, Walmsley, Blake, Welsby and Percival. The "when the players were on the pitch" diagram highlights one interesting thing: Line chart.  Longer lines show when players have been on the pitch for all of the scoring moments.  The line for Matty Lees starts at 0, and stops at about 5. Matty Lees got taken off early on and did not come back on. I haven't seen anything about him being injured so that's odd. 

Looking forward to doing this for the rest of the season. Each post is likely to be "figures for that game" and "figures for the season up to the end of that game."

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