F Test to Compare Two Variances

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var.test(x, y, ratio = 1, alternative = "two.sided", 
         conf.level = 0.95)

`x, y`	numeric vectors of data values.
`ratio`	the hypothesized ratio of the population variances of `x` and `y`.
`alternative`	indicates the alternative hypothesis and must be one of `"two.sided"`, `"greater"` or `"less"`. You can specify just the initial letter.
`conf.level`	confidence level for the returned confidence interval.

var.test performs an F test of the null that the ratio of the variances of the populations from which x and y were drawn is equal to ratio.

A list with class "htest" containing the following components:

`statistic`	the value of the F test statistic.
`parameter`	the degrees of the freedom of the F distribtion of the test statistic.
`p.value`	the p-value of the test.
`conf.int`	a confidence interval for the ratio of the population variances.
`estimate`	the ratio of the sample variances of `x` and `y`.
`null.value`	the ratio of population variances under the null.
`alternative`	a character string describing the alternative hypothesis.
`method`	the string `"F test to compare two variances"`.
`data.name`	a character string giving the names of the data.