Effect size from x2 statistic

C

Chrys

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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