[R] normality test

[Berton Gunter]

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