A generic function for extracting model information
# S3 method for glm
modelExtract(CFM)a list of extracted model components. Included are
model.frame a dataset of the covareits used to create the model
cov_co: covariate coefficients
sig: variance-covariance matrix
form: model formula
family: model family
out.nm: outcome covariates names
a model of class 'glm'
A function for extracting the model information required for using pscfit