RE: [R] normality test

From: Berton Gunter <gunter.berton_at_gene.com>
Date: Fri 29 Apr 2005 - 02:13:52 EST


Below.  

>
> Usually (but not always) doing tests of normality reflect a lack of
> understanding of the power of rank tests, and an assumption of high
> power for the tests (qq plots don't always help with that because of
> their subjectivity). When possible it's good to choose a
> robust method.
> Also, doing pre-testing for normality can affect the type I
> error of
> the overall analysis.
>
> --
> Frank E Harrell Jr

Also, qqplots or any other kind of screening for normality can affect the type I error.

Indeed, one might ask what type I error means in such circumstances. :-)

Indeed, one might ask what hypothesis testing means in such circumstances.

Cheers,
Bert



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