â€‹Expected Goals (xG) is measure that considers a teamâ€™s efforts on goal relative to the difficulty of the chance created. Lots of information on a given shot (player positioning, distance from goal, angles, body-part used etc.) is plugged into a statistical model which in turn produces the xG stat. High xG generally transfers to more dangerous chance creation â€“ it might be considered as a measure of threat.
â€‹The first table shows the xG table for the Premier League season so far using the publically available xG statistics (understat.com) ordered by total xG.
As expected, there's a correlation between xG's and actual goals scored but this is not perfect. For example, the correlation coefficient for for Home xG and home goals so far this season is .60. (and .62 for away xG and goals).