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.