Hi to all I found
an formular of an **
***p-Value Calculator for the Chi-Square test*
*http://www.danielsoper.com/statcalc/calc11.aspx*
*with the formula*
*http://www.danielsoper.com/statkb/topic11.aspx*
*what's the gamma function of this formula in r?*
*df=5*
*ch2=25.50878*
*the following code does not give the result  <0.001 for the values above *
*p= ((0.5^(df/2))/gamma(df))*(ch2^((df/2)-1))* (2.718281828459^(-ch2/2))  
or is there any other error?

Regards Knut
***

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