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

In sasLM: 'SAS' Linear Model

F-Test for the ratio of two groups' variances

Description

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

Usage

  vtest(v1, n1, v0, n0, ratio=1, conf.level=0.95)

Arguments

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

Details

For the confidence interval of one group, use UNIV function.

Value

The output format is very similar to var.test.

Author(s)

Kyun-Seop Bae [e-mail]

Examples

  vtest(10.5^2, 5190, 8.9^2, 3529) # NEJM 388;15 p1386
  vtest(2.3^2, 13, 1.5^2, 11, conf.level=0.9) # Red book p240

sasLM documentation built on Oct. 2, 2024, 9:06 a.m.