Selasa, 12 November 2013

Football Basics - Passing

In the role of a football performance analyst, IT skill is one of the necessary skills in the skill set. However, it shouldn’t be over-emphasised. If what you are doing everyday is video tagging to clip and code the game footage, and then produce individual clips for individual players and coaches (e.g. putting all the shot clips together for the striker). Can you consider yourself as an analyst? Are you really analysing the game? It is a topic covered by some posts (e.g. Video Editor v Performance Analyst). My view is that a football performance analyst should do much more than that to analyse the game. For example, performance analyst should have some knowledge about data management and statistical analysis in my opinion. However, in order to analyse the game, should the analyst have some basic football knowledge also? Some posts have covered the overlapping area between the coach and the analyst (e.g. Should all coaches be analysts?). I firmly believe a football coach has a higher potential to be a better performance analyst because of the football knowledge. Therefore, I have decided to set up a new category called “Basics” in the website. “Basics” means football basics and my aim is to cover football knowledge about various techniques, principles of play and tactical knowledge, system of play (formation), etc. Apart from using text, I will use lots of diagrams and videos to explain the technical points in football.

Why passing is so important?


The first topic I choose for this new category is passing because it is very important in a football game. It is one of the two techniques used most frequently - controlling and passing the ball. When a player receives the ball, over 80% of occasions he will pass the ball to a teammate and on other occasions he will either shoot or dribble (Hughes, 1987). The FA emphasised the importance of passing by considering the technical demands of the game in the book “The Future Game” (FA Learning, 2010).

These are some key statistics mentioned in the book about passing:
·         More teams at the highest level now value the retention of possession, with leading teams often dominating possession in the ratio of approximately two to one (or 65% to 35%)
·         Players regularly reach 80% pass success, with some players in the world class level having pass success rates of 90% and above
·         20% more passing and receiving situation during games comparing with 2002
·         One-touch passing: Champions League teams are creating as many as 50% of their goals with one touch passing sequences before the final strike at goal
To know more about passing, we can refer to the technical definition from the academic study (Ford et al, 2004):
Pass: player in possession sends the ball to a teammate (e.g. using the foot, thigh or chest; using various techniques such as ground, lofted, chip, flick or volley; over short or long distances)
There are different views to identify what a successful pass is. Some people said as long as a teammate has a touch of the ball then it is a successful pass (even the touch is bad and they lose possession). Another view suggests that the pass is successful if possession is retained (Carling et al., 2005). I prefer the latter definition.
Regarding the distance of the pass, Hughes (1987) suggested that short passes are 30 yards or less and long passes are more than 30 yards.
Generally, I divide passing techniques into two groups: ground pass and loft pass. There are many technical points to cover in these two passing techniques so I will leave it to next week. In conclusion, it is just a starting point of the new category. I will keep writing posts in other categories also. If you want me to talk about any particular topic, please feel free to leave the comment.

Reference:

CARLING, C., WILLIAMS, A.M., & REILLY, T., 2005. Handbook of Soccer Match Analysis. London: Routledge
Carroll, R., 2013. Video Editor v Performance Analyst [online][viewed 12 September 2013]. Available from: http://thevideoanalyst.com/video-editor-v-performance-analyst/
FA LEARNING, 2010. The Future Game. Great Britain: FA Learning
FORD, P., WILLIAMS, M., & BATE, D., 2004. A quantitative analysis of counter attacks from the defensive third. Insight, 7(3), 29-32
HUGHES, C., 1987. Soccer Tactics and Skills. Great Britain: Queen Anne Press
OXFORDSHIRE FA, 2013. The-future-game [digital image][viewed 12 November 2013]. Available from: http://www.oxfordshirefa.com/~/media/countysites/oxfordshirefa/images/boxes%20300x290/the-future-game.ashx?w=300&h=290

Sabtu, 02 November 2013

Time Analysis of Championship teams

There are 337 Championship goals (updated to 17/10/2013). By analysing the time at which goals are scored during match play, the characteristics of the teams could be shown. The 90 minutes game was divided into six 15-min periods. The upward trend shown in the following chart fits the findings of researchers (Jinshan et al., 1993; Reilly, 1996) and the time analysis I did for League 2 last season. Moreover, it is worthy to note that more goals were scored before the end of halves. Therefore, there is a small upward trend in each half of the game.

time analysis of Championship teams

The following table shows the number of goals scored in six periods of different teams. The data were shown in a Red-Yellow-Green colour scale. That means, the higher number would be highlighted by red and the lower number would be highlighted by green for better visualisation of the data.

table of goals

Generally, most of the teams scored more goals in the second half which fit the general trend. However, Ipswich is an exception as they scored the most goals (5 goals) in the first 15 mins of the game. The following video shows these 5 early goals of Ipswich.

http://youtu.be/xi79Z-AwJdg

Burnley is a team showing a speical characteristic that they are strong in scoring before the end of halves. They scored 6 and 5 goals before the end of first half and full time. These number are remarkably more than the number of goals they scored in other time slots. The following video shows these 11 goals Burnley scored before the end of halves.

Watford scored the most goals (7 goals) in the last 15 mins of the game while Sheff Wed and Doncaster are the only teams which haven’t scored any late goal at the moment. There is an interesting fact that Doncaster haven’t scored any early goal in the first 15 mins of the game also.
However, if we just count the goals scored, it is not showing the whole picture of analysis because stronger teams scored more goals. If we want to analyse more in depth, we have to convert these data into percentage. The following table shows the same set of data in percentage form.
table of percentages
Charlton has their characteristic that they are partcularly strong when they started their second half. 50% of their goals were scored in the first 15 mins of the second half. The following videos shows these 4 early goals in the second half of the game.

BlackpoolWigan and Yeovil are the similar teams which relied heavily on the last 15 mins to score goals. These three teams had more than 40% of their goals scored in this time slot.
Blackpool is the only team having less than 10% of goals in 4 time slots. In other words, nearly 80% of their goals were scored in 16-30 mins and 76-full time. It could be a useful stats for the team playing against Blackpool to decide when to put more effort to defend. The following video shows the 6 goals (46%) Blackpool scored in the last 15 mins.

Yeovil is another extreme example. They haven’t scored any goal in 2 time slots (16-30, 45-60) but they scored 50% of their goals in the last time slot. The team playing against them should pay extra attention to the last 15 mins of the game. The following video shows the 3 goals (50%) Yeovil scored in the last 15 mins.

Reference


Jinshan et al., 1993. Analysis of the goals in the 14th World Cup. In: J. C. a. A. S. T. Reilly, ed. Science and Football II. London: E. and F.N. Spon, pp. 203-205.
Reilly, T., 1996. Motion analysis and physiological demands. In: T. Reilly, ed. Science and Soccer. London: E. and F.N.Spon, pp. 65-81.