> I think I am trying to say, gently, that your basic question doesn't
> make very good sense to me;  and it did not, to Dennis, either.
> "Optimal"  is one problematic word.  Another problem is that
> you seem to ask about all research, in all of the world....  
> It might be a clever way to attack 'sample size', but I think 
> that hasn't been done.

Thanks for your advise. I see that the question is probably a little bit
overloaded and that optimal is not a good definition. But isn't there
something that determines the sample size of all statistical techniques? I
remember having read something a long time ago, that sample size of all
statistical techniques are influenced by alpha risk, power and effect size.
Is this wrong or is not applicable to my question?




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