
In sports (and in life), there is a tendency to seek answers to a variation on the question, "Is it better to be lucky or good?" In sports this plays out in attempts to quantify whether certain teams or players had a streak of luck that caused elevated performance or if they're really just that good.
I'd like to ask the opposite question of the 2018-19 Minnesota Wild: Is this team particularly unlucky or just not very good?
The crux of the question is built around the notion of "expected goals."
Through various data points involving shot quality – both in terms of shots taken and shots allowed – Corsica Hockey derives the expected goals statistic. Since we have data on both offense and defense for all teams, it's possible to determine expected goal differential – what you would expect a team's goal differential to be based on the quality and quantity of shots it takes and gives up.
Taking a look at this data during 5-on-5 play – a fair evaluation – we find that the Wild's expected goal differential this season is plus-25.62 (144.06 goals scored and 118.43 goals allowed). That expected differential is fifth-best in the NHL.
But the Wild's actual 5-on-5 goal differential this season is minus-12 (133 scored, 145 allowed). Every other NHL team in the top 13 of expected goal differential this season has a 5-on-5 goal differential of at least plus-12. The Wild is a huge outlier.
And the gap between the Wild's actual 5-on-5 goals and expected goals is 37.62 goals – by far the largest negative margin in the NHL. Next-worst is Carolina at 28.4 goals fewer than expected.
You can see how all the NHL teams compare in this visualization: