Quantifying Lucas' Absence

Quantifying Lucas' Absence

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The widespread disappointment that met the news of Lucas’ injury is a reflection on the Brazilian’s progress; his tale of zero to hero is now well-repeated in mainstream discussion.

Statistics have justified his continued role in the team. He’s been the league’s most prolific tackler both this and last season, and also produced a fine ball-winning display in his most recent league match.

His sudden absence has sparked speculation as to how Liverpool will cope. It’s entirely fair to suggest areas where Liverpool may be weakened, but what isn’t fair is to release misleading information. Shortly after the news, a prominent football tweeter posted:

Liverpool have a 48% win rate when Lucas starts and 29% when he doesn’t [since the start of the 2010/11 season]. He’s almost impossible to replace.

Such is the nature of social media that said statistic was perpetuated through over 100 retweets, undoubtedly frenzying already concerned fans, including initially myself. 19% sounds like a heck of a difference.

But as the table below begins to clarify, there are all sorts of issues with this statistic, issues that I have previously addressed in assessing Mikel Arteta’s absence at Everton:

Lucas has only failed to start 7 league games in 18 months, remarkable in itself but also ultimately the problem with the aforementioned statistic: 7 games, or even 13 for that matter, are simply not enough to draw conclusions from.

Liverpool have won 2 of their 7 matches without Lucas starting since the beginning of the 2010/11 season – but what if Pepe Reina hadn’t scored an unfortunate own goal against Arsenal, and what if Liverpool had converted another one of 20-odd chances at home to Norwich? One more win and Liverpool would’ve had a 43% win percentage without Lucas; two more (57%) and we’d be saying Liverpool are better off without him!

Essentially, the difference in win percentages is attributed to chance, and Liverpool fans (or fans of other clubs for that matter) needn’t pay attention to scare-mongering statistics.

Of course Lucas’ injury will be felt, but the fact is Liverpool have not yet played enough without the fully-matured Brazilian to draw any causal conclusions from previous absences. Even over the span of his entire Liverpool career, results cannot be attributed to the presence of Lucas on the field, much like Arteta at Everton.

Let the results speak for themselves, and analyse the effects rationally ex-post. I must stress that I do think Liverpool will suffer from Lucas’ injury; this is merely an exercise in getting the facts straight.

This post is also available on 5 Added Minutes. Opponents’ average points per game is a measure of the strength of opponents in each scenario. 

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5 responses to “Quantifying Lucas’ Absence”

  1. Charles Ong says:

    Good piece, Omar.

    The statistic came from someone working for Opta, and from the word ‘Opta’ alone it automatically is regarded as reliable. Whilst the statistic is correct, he failed to point out the obvious flaw in it – I too was suspecting that the sample size was too small, and your article addressed it neatly.

    The statistics bandied around on social media can be disregarded should things be taken into context and an in-depth look into it is done, which you’ve illustrated.

    If anything, this has also helped allay some initial fears of the possible impact Lucas’ absence could have on our forthcoming games.

    Good job and keep it up.

    • It definitely has Charles. I think it’s an excellent piece to show that context is required with the stats and that it is very difficult to quantify a statistic within 140 characters on twitter.

      Excellent work, as usual, Omar.

    • Cheers guys. Social media’s great until it starts perpetuating myths, really.

  2. […] or more accurately, and potentially scarily (for Liverpool fans) undisclosed. However perhaps all is not bleak (statistical problems withstanding, WE CAN HOPE CAN’T […]

  3. Dan says:

    He’s grown in confidence this season, working as hard as always but a little more adventurous..

    We’ve won more without Lucas, but as you say, context is important there. He’ll be missed for sure but we’ll cope must better than a few are predicting/hoping.

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Published by Anfield Index
Updated: 2013-11-01 16:30:38