Re: [R] extracting p value from GEE

[Tu Yu-Kang]

Hi,

Many thanks for your kind help.

best regards,

Yu-Kang

From: Emmanuel Paradis <[EMAIL PROTECTED]>
To: "Tu Yu-Kang" <[EMAIL PROTECTED]>
CC: [EMAIL PROTECTED]
Subject: Re: [R] extracting p value from GEE
Date: Fri, 05 Dec 2003 15:48:41 +0100
At 11:53 04/12/2003 +0000, vous avez 嶰rit:
Dear R users,

If anyone can tell me how to extract the p values from the output 
of gee?
They are easily computed from the output of summary(gee(...)) which 
prints either a "z" or a "t" depending in the "family" option. z 
follows, under the null hypothesis, a normal distribution N(0, 1), 
you have the corresponding P-value with (for a two-tailed test):

2 * (1 - pnorm(abs(z)))

t follows a 'Student' distribution with df degrees of freedom given 
by N- k - 1, where N is the number of observations, and k is the 
number of estimated paramaters. I think, but am not definitely sure, 
that N is counted among all clusters, and k is the number of 
parameters in the GLM eventually included the estimated scale 
(correlation parameters are not counted). As above, you have the 
P-value with:

2 * (1 - pnorm(abs(t), df))

HTH

Emmanuel Paradis


Many thanks in advance.

Yu-Kang

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