#+TITLE: Rapport package team
#+AUTHOR: Kruskal Wallis test
#+DATE: 2011-04-26 20:25 CET
** Description
In this template Rapporter will present you Kruskal Wallis test.
*** Introduction
[[http://en.wikipedia.org/wiki/Kruskal-Wallis][Kruskal-Wallis test]] is
a non-parametric statistical test that assesses hypothesis of equality
of two independent sample's/variabels' variances. Most of the time it's
being used beacuse the normality assumptions didn't meet for the
samples/variables, but we need the assumption of the equal variances, so
it can be an alternative of the Two-sample t-test. Significant result
means difference between the samples/variables.
| Test statistic | df | P value |
|------------------+------+----------------------|
| 1010 | 1 | /1.056e-221/ * * * |
#+CAPTION: Kruskal-Wallis test for /Age/ and /Internet usage for
educational purposes (hours per day)/
As you can see in the table the test's degrees of freedom is /1/, the
joint test-statistic is /1010/, so the p-value of the Kruskal-Wallis
test is /1.056e-221/. Thus we can reject the assumption of the equal
variances.
** Description
In this template Rapporter will present you Kruskal Wallis test.
*** Introduction
[[http://en.wikipedia.org/wiki/Kruskal-Wallis][Kruskal-Wallis test]] is
a non-parametric statistical test that assesses hypothesis of equality
of two independent sample's/variabels' variances. Most of the time it's
being used beacuse the normality assumptions didn't meet for the
samples/variables, but we need the assumption of the equal variances, so
it can be an alternative of the Two-sample t-test. Significant result
means difference between the samples/variables.
| Test statistic | df | P value |
|------------------+------+--------------------|
| 47.28 | 1 | /6.14e-12/ * * * |
#+CAPTION: Kruskal-Wallis test for /mpg/ and /drat/
As you can see in the table the test's degrees of freedom is /1/, the
joint test-statistic is /47.28/, so the p-value of the Kruskal-Wallis
test is /6.14e-12/. Thus we can reject the assumption of the equal
variances.
--------------
This report was generated with [[http://www.r-project.org/][R]] (3.0.1)
and [[http://rapport-package.info/][rapport]] (0.51) in /0.267/ sec on
x86\_64-unknown-linux-gnu platform.
[[images/logo.png]]