sigma2.test: Test of a variance In TRSbook: Functions and Datasets to Accompany the Book "The R Software: Fundamentals of Programming and Statistical Analysis"

Description

Comparing the theoretical variance with a reference value

Usage

 1 sigma2.test(x, alternative = "two.sided", var0 = 1, conf.level = 0.95)

Arguments

 x numeric vector alternative Alternative hypothesis for the test. Either two sided ("two.sided"), one sided to the left ("less") or one sided to the right ("greater"). Default is "two.sided". var0 value of reference for the variance conf.level confidence level

Value

Returns a list:

 statistic Value of the test statistic parameter degrees of freedom p.value p-value of the test conf.int confidence interval estimate sample variance null.value value of reference for the variance alternative Alternative hypothesis for the test method "One-sample Chi-squared test for given variance" data.name name of the data set

Author(s)

Lafaye de Micheaux Pierre <lafaye@unsw.edu.au>, Remy Drouilhet <Remy.Drouilhet@upmf-grenoble.fr>, Liquet Benoit <b.liquet@uq.edu.au>

References

Chapter 13 (Confidence Intervals and Hypothesis Testing) from the book: The R Software, Fundamentals of Programming and Statistical Analysis

Examples

 1 2 data(NUTRIELDERLY) sigma2.test(NUTRIELDERLY\$weight,conf.level=0.9)\$conf

Example output

gdata: read.xls support for 'XLS' (Excel 97-2004) files ENABLED.

gdata: read.xls support for 'XLSX' (Excel 2007+) files ENABLED.

Attaching package: 'gdata'

The following object is masked from 'package:stats':

nobs

The following object is masked from 'package:utils':

object.size

The following object is masked from 'package:base':

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