discret random distributions: test

[Jerome BENOIT]

Hello,

thank you very much for the answer.

Brian Gough wrote:
> Jerome BENOIT writes:
>  > I have just read in the source (GSL 1.5) the tests made
>  > to check the discret random distributions, but I cannot
>  > clearly figure out the idea behind the test:
>  > any hint is welcome.
> 
> randist/test.c samples the distribution and compares the resulting
> histogram with the pdf itself to see if they are compatible within
> statistical errors.
> 

I understood the sampling part and the comparing part.
What confuses me is the compatibility criteria.
In particular, why the undimensionless sigma
variable (a difference over a square root) is compare
to a dimensionless value (a constant) ?


Thanks,
Jerome