Function varTest

varTest(x: Sample, y: Sample, options?: VarTestOptions): VarTestResult
F test that the variances of two normal samples have a given ratio. Equivalent to R's var.test(). NaN values are dropped.
Parameters
- x: Sample
- y: Sample
- Optionaloptions: VarTestOptions
Returns VarTestResult
Example
```
varTest([1, 3, 2, 5, 4], [2, 9, 4, 12, 7, 1]).statistic; // 0.13761467889908255
```
There is also a formula form, varTest("y ~ g", data, options) (next overload).
- Defined in htest/varTest.ts:66
varTest(
    formula: string,
    data: DataFrame,
    options?: VarTestOptions,
): VarTestResult
F test of two variances from a formula and a data frame. As R's var.test(formula, data): "y ~ g" compares the two levels of g (the first level is x). Only the variables of the formula count: the rows where one of them is missing are dropped.
Parameters
- formula: string
  "y ~ g".
- data: DataFrame
  The data frame: an object of columns (null or NaN for a missing value).
- Optionaloptions: VarTestOptions
Returns VarTestResult
- Defined in htest/varTest.ts:75