What is the mathematical method(s)/formalisms that can be applied to the following case:(adsbygoogle = window.adsbygoogle || []).push({});

4 variables each having one-to-one correlation to each other in some complex underlying and inter-dependent way (which cannot be accurately defined as a model,however the behavior of a ratio of the variables under consideration over a period can be provided). Seeking a method to develop a model that could provide some general directional indicators on the inter-/intra- dependencies of the 4 variables to each other and in various combinations & permutations given any set/sub-set of variables of the four.

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# Applicable Mathematical method(s) & underlying formalism(s)

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