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From Al Chou <hotfusion...@yahoo.com>
Subject Re: [math] API changes for RC2
Date Mon, 27 Sep 2004 01:50:11 GMT
--- Kim van der Linde <kim@kimvdlinde.com> wrote:
> Al Chou wrote:
> > -0; question:  do people really use the population version?  When dealing
> with
> > real-world data or any other distribution that is not known a priori, how
> could
> > you, in good conscience?  And if you know the distribution a priori, why
> would
> > you need to compute statistics about it?
> 
> It depends if you want to minimise error or bias. We do use it at times, 
> just like we do change degrees-of-freedom (in many of our multivariate 
> analyses by 4 to be precise due to three modifications that take 1, 1, 
> and 2 degrees of freedom) in all kind of tests to correct for previous 
> calculations on the same data set. In some studies, the variance is 
> calculated relative to a set average, which become biased 
> the-other-way-around if you would use sample variances.
> 
> Anyway, I reported these examples back because of the real life usage.


Kim,

Thanks for your remarks.  I don't have enough background in statistical
analysis of data to envision how these operations are performed or what they
mean, but I'm glad to hear about real world usage.


Al

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