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# F-test

## Introduction

Execute F-test, which checks the difference of variances between groups.

## How to Access?

You can access from 'Add' (Plus) button.

## How to Use?

#### Column Selection

• Value Column - Numeric column whose variances is calculated.
• Group Column - Label column of 2 groups.

### Parameters

• Population Variance Ratio (Optional) - The default is 1. The hypothesized population variances ratio.
• Type of Alternative Hypothesis (Optional) - The default is "two.sided". What kind of alternative hypothesis to be used. This can be
• "two.sided"
• "less"
• "greater"
• Confidence Level (Optional) - The default is 0.95. The level of confidence interval.
• Subset (Optional) - a vector to specify a subset of observations to be used.
• NA Action (Optional) - The default is "na.fail". This changes the behaviour of NA data. Can be one of the following.
• "na.omit"
• "na.fail"
• "na.exclude"
• "na.pass"
• NULL
Take a look at the reference document for the 'var.test' function from base R for more details on the parameters.