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A copula is a multivariate distribution with uniform marginal distributions. Copulas are mostly used to represent/model the structure of dependence between random variables, separately from the margins.
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votes
Copulas simply explained
There is a brief and not overly technical introduction here:
http://prescientmuse.blogspot.co.uk/2015/01/a-brief-introduction-to-copula.html
And an application of use in a trading system with full R …