Re: variance reduction [Was Re: [Bug-gnubg] Measuring performance levels]

[nis]

On 24 Oct 2002 at 18:31, Joern Thyssen wrote:

> Sorry, I meant: "... since it requires 21 n-1 ply evaluations". 
> 
> BTW, is this actually necesary: we just want an estimate of the luck of
> the given roll. Would it be sufficient to do a 0-ply evaluation of the
> luck, or would that introduce bias?

A 0-ply variance reduction should be fine - it will of course be less 
effective than a 2-ply, but also very much faster. The entire point 
is that you can add anything which averages to 0.

I don't remember the context where Douglas asked for 2-ply VR - 
perhaps there was a reason?
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Nis Jorgensen
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