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  1. Introduction

In this post we compare the shot performance of M Salah at Roma and Livepool.  The objective is to find statistically significant (p<0.05) and non significant (but revealing) differences in his performance while at these clubs  Significant differences, when discovered, are indicated by the acronym SSD (Statistical Significant Difference) in their comment line.

Classification  using the Decision Trees method (https://en.wikipedia.org/wiki/Decision_tree_learning) is used for the analysis, and in particuar the CART algorithms.

  1. Stats and Analysis

Salah has played for Roma in Serie A in the 2016-17 season, and for Liverpool  in the EPL in 2017-18 

Salah 04

Salah 07

3. Summary of results

Our analysis shows that Salah’s shot performance has much improved at Liverpool.  The number of goals scored has doubled (31 vs. 15) with roughly the same number of matches and minutes played.  This is a strong indicator of better performance.  However, we must take into account that at Roma he had fewer shots (74 vs. 132) as Dzeko was the main target forward there.

The quality of his shot has also improved significantly (fig. 2).  But, unfortunately, this evaluation parameter (shotQality) is a rather subjective one in the data we used, and should not be given too much weight.  However, Salah is definitely shooting more with his left foot at Liverpool (Fig. 3). And under more defensive pressure than at Roma (Fig. 4), while receiving more Open Play passes (fig. 5).

His main shooting location has also shifted from the right to the centre-right.  At Roma, his shots came mainly from the right side of the goal (Pic. 1), while at Liverpool are more evenly distributed, though the right side remains favourite.   Logically, this is also the side where most of his shots assists came from, with Mane and Firmino the main providers.

 

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Data by @StrataBet
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