Re: [R] Generalized Estimating Equations and log-likelihood calculation

2004-02-19 Thread Henric Nilsson
At 18:29 2004-02-18, you wrote: Is anyone aware of a way to calculate log-likelihood for GEE models? No. GEE fitting is based on quasi-likelihood. However, it is possible to derive AIC-like measures based on the quasi-likelihood. Lebreton et al (1992) suggested a simple adjustment in the GLM

Re: [R] Generalized Estimating Equations and log-likelihood calculation

2004-02-19 Thread Henric Nilsson
At 09:17 2004-02-19, you wrote: For GEE models, Pan (2001) has introduced QIC. None of these measures are implemented in R or in any add-on package as far as I know. Actually, take a look at http://hisdu.sph.uq.edu.au/lsu/SSAI%20course/course_tools.htm Henric

Re: [R] Generalized Estimating Equations and log-likelihood calculation

2004-02-18 Thread Prof Brian Ripley
On Wed, 18 Feb 2004 [EMAIL PROTECTED] wrote: I'm working with clustered data sets and trying to calculate log-likelihood (and/or AIC, AICc) for my models. In using the gee and geese packages one gets Wald test output; but apparently there is no no applicable method for logLik