Re: [R] shapiro wilk normality test

From: Bunny, lautloscrew.com <bunny_at_lautloscrew.com>
Date: Sat, 12 Jul 2008 18:20:29 +0200

Hmm thanks,
But on the other hand it just says i cant reject normality, which doesnt really mean it is normal. Wouldnīt be nice to test for non- normality ? if iīd reject that a high level i could be pretty sure it īs normal... ??

thanks in advance

matthias
Am 12.07.2008 um 18:10 schrieb Mark Leeds:

> Hi: If normality is the HO, then the test below says don't reject
> ( large p
> value ). Check out any multivariate text for what the null of the
> shapiro
> test is. I don't know for sure but, from below, it sure looks like
> HO is
> normality. Or google for it.
>
>
>
> -----Original Message-----
> From: r-help-bounces_at_r-project.org [mailto:r-help-bounces_at_r-project.org
> ] On
> Behalf Of Bunny, lautloscrew.com
> Sent: Saturday, July 12, 2008 11:30 AM
> To: r-help_at_r-project.org
> Subject: [R] shapiro wilk normality test
>
> Hi everybody,
>
> somehow i dont get the shapiro wilk test for normality. i just canīt
> find what the H0 is .
>
> i tried :
>
> shapiro.test(rnorm(5000))
>
> Shapiro-Wilk normality test
>
> data: rnorm(5000)
> W = 0.9997, p-value = 0.6205
>
>
> If normality is the H0, the test says itīs probably not normal, doesn
> īt it ?
>
> 5000 is the biggest n allowed by the test...
>
> are there any other test ? ( i know qqnorm already ;)
>
> thanks in advance
>
> matthias
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Sat 12 Jul 2008 - 16:25:49 GMT

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