[Kst] Scalar list - RMS vs sigma

Barth Netterfield netterfield at astro.utoronto.ca
Tue Oct 24 13:28:25 CEST 2006

rms is sqrt(sum(x^2))/n

sigma is sqrt(sum((x - xM)^2))/(n-1)

where xM is the mean of x.

With large n, when the mean of the vector is zero, they are the same.  
Otherwise, they are different.


On Tuesday 24 October 2006 04:05, Markus Luisser wrote:
> Hi folks!
> I have a short question about the RMS and the sigma scalars in the scalar
> list.
> Unfortunately I was unable to find documenation about that and reading the
> source code didnt shed much light on the issue for me.
> So my question: How are they defined, what is the difference?
> Cheers and thanks in advance.
> Markus
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