extract method for gee objects created by the
gee function in the gee package.
# S4 method for class 'gee'
extract(model, robust = TRUE, include.scale = TRUE, include.nobs = TRUE, ...)A statistical model object.
If TRUE computes robust standard errors in the variance-covariance matrix.
Report the dispersion or scale parameter?
Report the number of observations in the GOF block?
Custom parameters, which are handed over to subroutines, in this
case to the summary method for the object.