R help - Jan 2012 - How to get cov matrix of regression parameters in GEE using 'geese' or 'geeglm''

Dear R users,

I fitted a GEE model using the function 'geese' (or 'geeglm')
with user
defined
correlation matrix. I want to get the var-cov matrix of the regression
coefficients. But the output provides only limited information.  



I would be very much thankful if you could kindly let me know how to get
it..since I am struggling lot getting this.

Thanks

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