[R-sig-ME] Questions on the results from glmmPQL(MASS)
David.Duffy at qimr.edu.au
Mon Dec 8 06:40:33 CET 2008
On Sun, 7 Dec 2008, zhijie zhang wrote:
> Dear Rusers,
> Sorry for re-post my question in this list. Some person has recommend
> that this list is more specific for me.
> I have used R,S-PLUS and SAS to analyze the sample data "bacteria" in
> MASS package. Their results are listed below.
> Q3:In SAS and other softwares, we can get p-values for the random effect
> 'sigma', but i donot see the p-values in the results of R/SPLUS. I have used
> attributes() to look for them, but no p values. Anybody knows how to get
> p-values for the random effect 'sigma',.
Someone answered your specific questions before.
Because this is a simple random intercept model, you can also use the
glmmML R package, which gives:
glmmML(y ~ trt + I(week > 2), cluster=ID, family=binomial, data=bacteria)
coef se(coef) z Pr(>|z|)
(Intercept) 3.5482 0.6933 5.118 3.09e-07
trtdrug -1.3667 0.6768 -2.020 4.34e-02
trtdrug+ -0.7826 0.6830 -1.146 2.52e-01
I(week > 2)TRUE -1.5986 0.4754 -3.363 7.71e-04
Standard deviation in mixing distribution: 1.242
Std. Error: 0.4024
Residual deviance: 192.3 on 215 degrees of freedom AIC: 202.3
You can then construct a test for the random effect.
| David Duffy (MBBS PhD) ,-_|\
| email: davidD at qimr.edu.au ph: INT+61+7+3362-0217 fax: -0101 / *
| Epidemiology Unit, Queensland Institute of Medical Research \_,-._/
| 300 Herston Rd, Brisbane, Queensland 4029, Australia GPG 4D0B994A v
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