There might be a test that uses "not normal" as the HO but I don't know of it. There's been a lot of discussion on this list in the past on the pitfalls associated with tests of normality in general so maybe you can find them in the archives.
I think you should figure out why you are testing for normality and then decide on the test you want to use because ( qqplot could be enough ) , many of the procedures done in statistics can be robust to departures from normality anyway. Others, much more fluent than I in this area, hopefully can give more specific advice. -----Original Message----- From: Bunny, lautloscrew.com [mailto:[EMAIL PROTECTED] Sent: Saturday, July 12, 2008 12:20 PM To: Mark Leeds Cc: r-help@r-project.org Subject: Re: [R] shapiro wilk normality test Hmm thanks, But on the other hand it just says i cant reject normality, which doesnt really mean it is normal. Wouldn´t be nice to test for non- normality ? if i´d reject that a high level i could be pretty sure it ´s 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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > ] On > Behalf Of Bunny, lautloscrew.com > Sent: Saturday, July 12, 2008 11:30 AM > To: r-help@r-project.org > Subject: [R] shapiro wilk normality test > > Hi everybody, > > somehow i dont get the shapiro wilk test for normality. i just can´t > 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 it´s probably not normal, doesn > ´t it ? > > 5000 is the biggest n allowed by the test... > > are there any other test ? ( i know qqnorm already ;) > > thanks in advance > > matthias > ______________________________________________ > R-help@r-project.org mailing list > 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. > ______________________________________________ R-help@r-project.org mailing list 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.