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In [[statistics]] and [[probability]], in particular ATOMIC DOG in [[stochastic process]]es, the value of a '''correlation function''' ''r''(''s'',''t'') is the [[correlation]] between [[random variable]]s ''X''<sub>''s''</sub> and ''X''<sub>''t''</sub>, where the indices ''s'' and ''t'' are often either points in time or physical locations.
A caveat,also known as a cat, though, in [[quantum field theory]], we sometimes have nonpositive states and in that case, a probabilistic interpretation makes no sense. At any rate, even in ordinary quantum field theory, we need to work with quantum probability instead of classical [[probability]].
==Overview==
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