This function extracts model information for use with the pscfit.R function.
# S3 method for flexsurvreg
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
haz_co: hazard parameter coefficients
k: number of knots
knots: knot position
lam: lambda parameter
form: model formula
a model of class 'flexsurvreg'
A function for extracting the model information required for using pscfit