I often encounter (and use) this phrase in a context meaning to weight more heavily during decision making than is sensible, or to focus more heavily during a discussion than is warranted. For example, "You're over indexing on the one time he failed; by & large he succeeds."
What is the origin of this phrase?
Best Answer
This blog post talking about use of the phrase as Microsoft quotes some Google Ngrams evidence to suggest that the phrase might have originated in econometrics: