vtest

F-test for the ratio of two groups' variances. This is similar to <code>var.test</code> except using the summarized input.

This is a core implementation of 'SAS' procedures for linear models - GLM, REG, ANOVA, TTEST, FREQ, and UNIVARIATE. Some R packages provide Type II and Type III SS. However, the results of nested and complex designs are often different from those of 'SAS'. Different results do not necessarily mean incorrectness. However, many want the same results as 'SAS'. This package aims to achieve that.
Reference: Littell RC, Stroup WW, Freund RJ (2002, ISBN:0-471-22174-0).

Kyun-Seop Bae

sasLM

'SAS' Linear Model

vtest function

<dl> <dt>v1</dt>
<dd>sample variance of the first (test, active, experimental) group</dd> <dt>n1</dt>
<dd>sample size of the first group</dd> <dt>v0</dt>
<dd>sample variance of the second (reference, control, placebo) group</dd> <dt>n0</dt>
<dd>sample size of the second group</dd> <dt>ratio</dt>
<dd>value for the ratio of variances under the null hypothesis</dd> <dt>conf.level</dt>
<dd>confidence level</dd></dl>

Arguments

Author

F-Test for the ratio of two groups' variances — vtest

<dl>

 <dt>v1</dt>
<dd>sample variance of the first (test, active, experimental) group</dd>

 <dt>n1</dt>
<dd>sample size of the first group</dd>

 <dt>v0</dt>
<dd>sample variance of the second (reference, control, placebo) group</dd>

 <dt>n0</dt>
<dd>sample size of the second group</dd>

 <dt>ratio</dt>
<dd>value for the ratio of variances under the null hypothesis</dd>

 <dt>conf.level</dt>
<dd>confidence level</dd>

</dl>

vtest: F-Test for the ratio of two groups' variances

Description

Usage

Value

Arguments

Author

Details

Examples