Re: Effect size from x2 statistic

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Chrys,

First, when you type "x2" are you referring to chi-square?

If so, the formula you cite does look a little odd. The standard definition
of "effect size" in statistical analysis is the difference between two
averages divided by the standard deviation of the values that underlie those
averages. I can speak with some authority here: I was there when my grad
school advisor invented the technique and the term.

--
C^2
Conrad Carlberg

Excel Sales Forecasting for Dummies, Wiley, 2005


"Chrys" <despinaa_despo@xxxxxxxxx> wrote in message
news:1125756722.412319.117830@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hi!
> I have found this formula which says that computes effect size from x2
> statistic . Firtly what do you think about it ? Could anyone help me in
> writing a macro or syntax in EXCEL for this formula or does anyone know
> a free program that calculates the ES using this formula ?
>
> ES= the square root of 4(x2)/N-x2
> Thanks
>


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