I have a couple of elementary but earnest questions about fancy stat methodologies that I am sure are addressed multiple places, but I don't have the motivation to wade through the literature right now.
How are shot attempt data collected, i.e. who collects them? Are shot attempt metrics like Corsi reliant on official NHL statisticians? If so, how do they account for variables like the well-documented differences in how official stats are compiled in various rinks around the NHL? A shot in Columbus ≠ a shot in Calgary; a blocked shot in SJ ≠ one in New Jersey.
Or are these data tracked and compiled by analytics guys themselves? I get that each team probably does their own tracking. But where do the data used by bloggers come from?
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