I always see people looking at stats as averages, or extrapolated averages (e.g. Per 36 minutes). How come no one ever looks at the variance of those stats?

For example, the standard deviation for FG% or rebounds would tell us a lot about consistency and, therefore, reliability. If one player shoots 40% one night and 50% another, whereas another player shoots 45% both nights, who would you rather have?

I'm not sure if the advanced metrics take this into account, but I haven't read that they do. I guess this is more a question for Blake, but just wondering, is all...