Re: Determining if samples are normal

[Robert A. Macy]

Sorry, to jump in where I have very little knowledge and
understanding, but doesn't the sum preserve the
distribution?  Seems counter intuitive to have the sum
change the distribution if it's identical.  Isn't it
multiply that makes it triangular?

           - Robert -

On Mon, 26 Sep 2005 12:19:50 -0400 (EDT)
 Przemek Klosowski <address@hidden> wrote:
>    You warp it by the normal curve so that 'normal' data
> will produce a 
>    streight line.
> 
> That's very clever, but it's not a very sensitive test:
> for y=rand(100,1)+rand(100,1)
> nt(y) returns 0.996 (this holds even when one uses 10000
> points for better stats).
> The distribution of rand+rand is triangular, so noone
> would mistake it for a gaussian.
> 



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