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How do i check that two random variables satisfy the requirements for computing correlation via Pearson or Spearman? If the data is non-linear/ non-Monotonic, are there other tests i could use to compute a correlation coefficient?

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    Once the variables are random, there is nothing like linear and non-linear. Only thing you need is adequate/ minimum sample size to cope with population.2014-09-12
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    the tests are not needed. What is needed is to examine data-type.2014-09-12

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