Conversion

Reep Revisited by Dave Laidig

I recently created a decent set of MLS possession data while working on another project, and I was curious if the patterns of the famous Reep analysis would hold for MLS. Thus, I attempted to replicate his result, and perhaps offer a couple new perspectives to the data.

I was first introduced to the legacy of Charles Reep while reading The Numbers Game (by Chris Anderson & David Sally). Reep was an early advocate for applying statistics to soccer, and was famous for tracking game events by hand over many seasons. According to his data, most goals were scored from possessions with three passes or fewer. And this was taken as empirical justification to play directly; minimizing the touches with longer passes in order to improve results.

Although Reep’s status as a pioneer in the sport is secure, many still debate the results and interpretation. Some critiques assert the underlying data was misinterpreted. Highlighting a simple majority of goals may not be the best analysis when most possessions had three or fewer passes anyway. Others suggest the structure of the analysis confuses correlation with causation; leading to misapplication of the results. In short, one can’t tell if the results were caused by the number of passes, or whether some other factors have causal roles. As I attempt to recreate the analysis; it’s worth stating the same criticisms and critiques apply to this replication effort as well.

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Why the West is better than the East: they take better (but fewer) shots by Alex Rathke

About two weeks ago James Yorke of Statsbomb wrote an end of season review for the 2015/2016 Premier League where he outlined a few shot and conversion figures. I found these figures intriguing and decided to use the same process to evaluate the MLS and more specifically if there are any differences between the Eastern and Western conferences. Before we examine any differences between the two MLS conferences, let’s have a look at the league as a whole.

From 2011 to the current season, the figures match up as follows. Keep in mind that the 2016 season is currently in a busy schedule (I have only been able to factor in games up until and including Sporting Kansas City vs Orlando City on May 15th 2016).   

Table after the jump.

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