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: the relationship between things that happen or change together
Full Definition of CORRELATION
: the state or relation of being correlated; specifically: a relation existing between phenomena or things or between mathematical or statistical variables which tend to vary, be associated, or occur together in a way not expected on the basis of chance alone <the obviously high positive correlation between scholastic aptitude and college entrance — J. B. Conant>
In statistics, the degree of association between two random variables. The correlation between the graphs of two data sets is the degree to which they resemble each other. However, correlation is not the same as causation, and even a very close correlation may be no more than a coincidence. Mathematically, a correlation is expressed by a correlation coefficient that ranges from 1 (never occur together), through 0 (absolutely independent), to 1 (always occur together).