R help - Jun 2012 - How to calculate chi sqaure value from statistical value and degrees of freedom?

Hi,

How to calculate chi sqaure p value for given statistical value and degrees
of freedom.

Input : 
x = statistical value
d = degrees of freedom
output: 
p value = ? 

Regards

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Hi,

Try

pchisq(q,df)

available at help(Chisquare)

Ozgur

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Hi, 

My input is chi square statistical value and degrees of freedom. But i m
getting different p values with the above formula.

I double checked my values with the below calculator. 

http://vassarstats.net/tabs.html#csq

Pls help me out.  

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Hi,

Actually, pchisq(q,df) calculates the cumulative distribution function by
default.

To calculate the p-value, you can use either

1-pchisq(q,df)

or

pchisq(q,df,lower.tail=FALSE)

PS: I checked, the p value yielded by R and the calculator for which you
give a link, for some "q" and "df" values, and these two are
same.

Best
Ozgur

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