function of partial derivates of net survival depending on theta (estimated parameters) from a mixture cure model with uncured survival following a Weibull distribution
dsndtheta_wei(
z_ucured = z_ucured,
z_pcured = z_pcured,
x = x,
theta = theta,
cumLexctopred
)
covariates matrix acting on survival function of uncured
covariates matrix acting on cure proportion
time at which the estimates are predicted
estimated parameters from the ouput of a mixture cure model implemented in curesurv
pre prediction obtained with cumLexc_alphaweibull_topred