Description should be language-agnostic

Java translation

python new test frameworks

As stated at Wikipedia:

For discrete distributions, there is no universal agreement on selecting the quartile values.

So I think it should be mentioned in description that which method(1, 2, 3, or 4) should be used for calculating lower and upper quartile of a sequence with odd number of data.

Python new test framework should be used (Refer this for more detail)

python new test framework is required. updated in this fork

In Java, it is rather hard to read values from Limit if the names of the exposed variables are never mentioned, and the definition of Limit is not available.

Also missing an edge case where required = 0 and hence should return 0.

The kata needs actual random tests: the only places where the test case are randomized all expects -1.

• Description should be language-agnostic

• The range of n should be stated

If you want to actually test our knowledge of is_correlation_causal, you can't just put in a return value in initial code that can pass the tests: it doesn't teach anything if we don't even to touch it in the first place. At least it should be something like pass.

Even the linked Wikipedia article contains multiple definitions of correlation coefficient, so it's unclear which one is expected.

Laziness isn't enforced.