Function bartlettTest

bartlettTest(groups: readonly Sample[]): BartlettTestResult
Bartlett's test that the variances of several normal samples are equal. Equivalent to R's bartlett.test(). Takes a list of samples. NaN and infinite values are dropped, as in R.
Parameters
- groups: readonly Sample[]
  The samples (at least two), each with at least two finite values.
Returns BartlettTestResult
Example
```
bartlettTest([[1, 3, 2, 5], [2, 9, 4, 12, 7], [3, 3.5, 4, 2]]).statistic;
```
There is also a formula form, bartlettTest("y ~ g", data) (next overload).
- Defined in htest/varTest.ts:170
bartlettTest(formula: string, data: DataFrame): BartlettTestResult
Bartlett's test from a formula and a data frame. As R's bartlett.test(formula, data): "y ~ g", one group per level of g, in the order of the levels. 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 BartlettTestResult
- Defined in htest/varTest.ts:179