Integrand for numerical integration of Weibull series likelihood

Computes h_c(t) * S(t) where h_c = sum_j in c h_j(t) and S(t) = exp(-sum_l H_l(t)). Used for left-censored and interval-censored observations in the heterogeneous Weibull model.

Usage

wei_series_integrand(t, shapes, scales, cind)

Arguments

t

time values (vector, for use with stats::integrate)

shapes

shape parameters for all components

scales

scale parameters for all components

cind

logical vector indicating which components are in candidate set

Value

vector of integrand values