
A remember a (very long!) while ago someone in this forum (FDAXHunter?) posted a link to a paper that described various interpretations of dot/inner product (probably upto ten or something like that). I somehow lost that link. If anyone remembers that can you please post it here again. Thank you! 
Eat shit! Millions of flies can't all be wrong... 



Do you mean this one?
Thirteen Ways to Look at the Correlation Coefficient, Joseph Lee Rodgers and W. Alan Nicewander, The American Statistician, Vol 42, No 1 (Feb 1988), 5966 



Yes! That is the paper I was looking for. Thanks Tradenator! 


