The program performs F-test for significantly different variances. The test trying to reject the null hypothesis that variances of two distributions are actually consistent. The statistic F is the ratio of one variance to the other. The values of the statistic either >> 1 or <<1 will indicate very significant differences. The null hypothesis (of equal variances) is trying to be rejected by either very large or very small values of F, so the significance is two-tailed.

File should contain table of numerical data: lines for observations (cases) columns should be separated by tabulation or user-defines symbol (; , etc); for example, if comma (,) separator is used, the file format is the same as the CSV (comma separated values) format. No missing data allowed.

This program use statistical functions from "R" free software environment for statistical computing and graphics (http://www.r-project.org).

This program requires the R-package to be installed on your computer.