The stat appears to be somewhat Duckworth-Lewis in terms of how it is calculated, in terms of distance, clear paths to goal, angular trajectory, etc. It may well be useful in predicting match outcomes, team efficiency, etc, but given that the ratio of shots on target converted into goals serves a similar purpose, are expected goals entirely necessary?
http://www.telegraph.co.uk/football/...remier-league/
http://www.telegraph.co.uk/football/...remier-league/
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