If A coefficient can be a number multiplied by a variable, why could be the "correlation coefficient" called therefore? Stack Trade network is made of 183 Q&A communities together with Stack Overflow, the biggest, most trusted online Local community for developers to know, share their expertise, and Develop their Professions. https://share.evernote.com/note/d52ee663-263e-7b7b-4337-d56a5ded479b