A function which defines the likelihood for a PSC model where the Counter Factual Model (CFM) takes the form of a 'flexsurvreg' object and an efficacy parameter (\(\beta\)) is being estimated. For more details on fitting please see ?pscfit and ?pscEst
lik.flexsurvreg(beta, DC_clean)a parameter to be estimate
a cleaned dataset including covariates to match the CFM
A likelihood function for use by pscfit for a model of class 'flexsurvreg'