This function obtains an estimating equation of H at the first observed survival time t1.
SolveHt1(Ht1, Z, nu, t, X, W, theta)
The solver solves for an optimal value of Ht1 by equating the estimating equation to zero.
The observed survival time, which is the minimum of T, C and A.
The censoring indicator for T or C
A fixed time point
Data matrix with covariates related to T.
Data matrix with covariates related to C.
Vector of parameters