I have no idea what expected goals are, maybe it's based off chances created. That website - Grantland - is a bit of a catch all but they use a lot of advanced statistics in their analyses. They're often quite complimentary of us, usually worth the read.Hahaha, he works hard though.
I really cannot understand what expected goals scored and expected goals conceded are. Plus how do you have .8 of a goal. Too much for my hungover head to cope with.