Question:
Is there a correlation between passing in the final third and the goals scored?
I used the #MCFCAnalytics data set to find the answer.
Analysis
Plot of Total # of completed passes in the final vs. Goals scored for all the 20 teams in the 2011-12 season of the Barclays Premier League
Findings:
- Linear regression had an R2 of 0.671indicating a strong correlation between passes completed in the final third and goals scored.
Excluding the outlier of Liverpool from the dataset the R2jumped to 0.827.
- Liverpool is ranked 3rd in the # of passes completed in the final third. However, they are only ranked 15th in goal scored.
- 75.73– Liverpool’s expected goals scored based on the above regression. However, they managed to score only 42 goals.
- What is the reason for the huge negative difference?
- Swansea’s case is interesting. You may remember the term “Swansealona” was one of the favorites with EPL analysts and reporters last season due to their reputation for passing style and high amounts of possession. However, they are below the league average on passes completed in the final third.
- Newcastle is ranked 18th in passes completed in the final third. However, Newcastle is ranked 7th in goal scored.Expected goals scored for Newcastle is 29.6. They managed to score 51!
- Blackburn is ranked last in passes completed in the final third. However, Blackburn scored a lot more goals (44) than their expected goals scored (24.2)
- Stoke is at the bottom – Lowest # of goals scored and 2nd lowest # of passes completed in the final third. Not surprising based on their style of play.
Liverpool
I hypothesized that
- Liverpool might be crossing a lot and
- Most crosses occur in the final third. (I would love to look at (X,Y) data to establish this fact.)
- Poor shot quality (which might or might be related to their propensity to cross)
Findings:
|
Player
|
Attempts
|
Efficiency
|
| Downing |
148
|
0.209
|
| José Enrique |
138
|
0.210
|
| Henderson |
72
|
0.125
|
| Adam |
70
|
0.157
|
| Gerrard |
69
|
0.203
|
| Bellamy |
67
|
0.194
|
| Johnson |
65
|
0.185
|
| Kuyt |
57
|
0.246
|
| Suárez |
47
|
0.149
|
| Kelly |
38
|
0.105
|
| Liverpool Average |
|
0.192
|
| League Average |
|
0.202
|
- 2 – According this article on EPLIndex, Liverpool scored just 2 goals from 840 open play crosses all season. That is 1 goal per every 420 open play crosses.
- 79 – The average # open play crosses per goal scored in the 2011-12 season. Liverpool are almost 10 times worse than Man United (44.5) and Norwich (45.1) in open play crosses/goals category. If there ever was a stat that would (or should) regress to the mean, this is it.
Liverpool had a very talented team in 2011-12. This manifested itself in their high # of completions in the final third where the defensive pressure is highest. Once they are in possession in the final third, they seem to have relied heavily on “crossing the ball” to enable their center-forward Andy Carroll to take a shot (or head) OR knock it down for their attacking midfielders and wide forwards to take a shot. One big problem was that delivering crosses is not a very efficient way of passing the ball. Another problem was they did not seem to have a plan B. It is quite possible that opponents have figured out Liverpool’s crossing strategy and their lack of plan B. The combination of these three factors has contributed significantly to the poor offensive display of Liverpool last season.
Newcastle United
- 4th – Newcastle is 4thbest in shooting efficiency (goals scored/(shots on target + shots off target)). They stayed 4th even when I included blocked shots in the denominator.
- This could be the reason why they are an outlier in the final-third completions vs goal scored plot.
- Manchester City, Arsenal and Manchester United are the top – 3 in shooting efficiency.
Newcastle had two great strikers in Demba Ba and Papisse Cisse who accounted for 29 goals between them. These two were the focus of Newcastle attack and were very efficient with their shots. They did not need a high # of completed passes in the final third to score their goals as they were able to convert a higher % of their shots into goals.
Blackburn Rovers
- 7th – Blackburn are 7th best in shooting efficiency inside the box (goals scored from inside the box/(shots on target inside the box + shots off target inside the box)).
- Yakubu scored 17 goals for Blackburn and has the 2ndbest Goals to Shots ratio among all the forwards who have scored than 10 goals.
- This could be one of the reasons for their big positive differential between actual goals scored (44) and the expected goals scored (24.2).
Summary
# of successful passes in the final third has a strong correlation to goals scored.
Final third is a “high-value” area for scoring goals. More completions in the final third means a team is spending more time in the high-value area. This translates into more opportunities to take a shot or draw errors from defenders to win set pieces from close range, which further increase scoring opportunities.
A high number of completions in the final third alone might not guarantee goals. Liverpool and Newcastle , two examples from the two extremes of the outlier spectrum are cases in point. However, it is one of the key contributing factors to scoring goals. The fact R2 jumped from 0.671 to 0.827 when Liverpool’s data was excluded from the data set strengthens is a case in point.
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