# World Cup Data Analysis For Fun – Part II

Continuing from Part I ( http://www.hiregion.com/2014/06/world-cup-data-analysis-for-fun-i.html ), following chart shows density of number of goals scored by country in a world cup tournament.  Black line in the fore ground is the average density of goals.

Some interesting facts:
* Purple peak is Wales with four goals in 1958 and that is the only year they played.
* Organge-yellowish peak is Bolivia scoring no goals twice and one goal once
* Large percentage (~80%) score no more than 10 goals in each tournament

Goals For Summary (per country per cup):

• Min. :        0.0
• 1st Qu.:     2.0
• Median :   4.0
• Mean :      5.7
• 3rd Qu.:    8.0
• Max. :     27.0
Goal Against Summary (per country per cup):

• Min.   :     0.0
• 1st Qu.:    4.0
• Median :  5.0
• Mean   :   5.7
• 3rd Qu.:   7.0
• Max.   :  17.0
While it is low number of goals scored in a each world cup (see chart above) it is also interesting to see the trend over many decades of all goals (scored + allowed) per game.  Here I applied the LOWESS (locally weighted scatter plot smoothing) non-parametric regression to better fit the data (blue line).

Though early in early years there were lot more goals each game, in the recent past (after 1970) it has stabilized around 2.7 goals per game.  But how do soccer power houses (Argentina, Brasil, Germany, etc.) compare with seven other countries chosen from another cluster (See part 1).  As one would expect you have to score more than you allow 🙂 and represented by gray dashed line on Y-axis i.e,

Goals Scored / Goals Allowed > 1

The colored year shows the winner of the World Cup on that year while the size of the bubble shows the total goals (Scored plus Allowed).  Six countries won all world cups between 1930 and 2006 except for the years 1930 and 1950 when Uruguay won and there were no world cups during 1942, 1946.

The outlier you see at the left top screen (BR, 10) is when Brazil scored 10 goals but allowed only 1 goal in 1986 in 5 matches while Argentina was the world cup winner scoring 14 goals and allowing 5 goals in 7 matches.

And the bottom (US, 0.14) big dot is for when US scored 1 goal and allowed 7 goals in 1934.