Function kruskalTest

kruskalTest(
x: Sample | readonly Sample[],
g?: readonly GroupLabel[],
): ChisqStatTestResult
Kruskal-Wallis rank sum test. Equivalent to R's kruskal.test().
Parameters
- x: Sample | readonly Sample[]
  An array of samples (each with at least one non-missing value, as R requires), or one sample with group labels g.
- Optionalg: readonly GroupLabel[]
  Group labels, parallel to x.
  
  There is also a formula form, kruskalTest("y ~ g", data) (next overload).
Returns ChisqStatTestResult
Example
```
const r = kruskalTest([[2.9, 3.0, 2.5, 2.6, 3.2], [3.8, 2.7, 4.0, 2.4], [2.8, 3.4, 3.7, 2.2, 2.0]]);
r.statistic; // 0.7714285714285722
r.pValue;    // 0.6799647735788935
```
- Defined in htest/rankTests.ts:80
kruskalTest(formula: string, data: DataFrame): ChisqStatTestResult
Kruskal-Wallis test from a formula and a data frame. As R's kruskal.test(formula, data): "y ~ g", one group per level of g. Only the variables of the formula count: the rows where one of them is missing are dropped.
Parameters
- formula: string
  "y ~ g" (one variable on each side).
- data: DataFrame
  The data frame: an object of columns (null or NaN for a missing value).
Returns ChisqStatTestResult
- Defined in htest/rankTests.ts:89