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Function Likelyhood for GEE
2 messages · marcioestat at pop.com.br, Ken Beath
On 17/04/2008, at 5:04 AM, marcioestat at pop.com.br wrote:
Hi listers, I am analyzing an anova with repeated measures with the function GEE and I would like to verify the best structure for the matrix of variance and covariance... So I need to obtain the function of likelyhood to make the test of comparation between two models (full and reduced)... Does anybody could tell me how do I obtain the likelyhood... (-2log(likelyhood M0/likelyhood M1))
Likelihood doesn't exist for GEE models. If the robust SE are similar to the working then the covariance structure is probably close enough. You-Gan Wang (http://www.cmis.csiro.au/You-Gan.Wang/ ) and others have developed some more technical methods, but they don't seem to be widely applied. Ken