log h0(tau) for each baseline function, as a brms expression string

Each entry is the expression string of log h0(tau) for one function of h0_catalogue, which brms uses to build the model formula. The strings are written in terms of the parameter names and the data columns log_tau (the log of the row's elapsed exposure time), for weibull tau_ref (the reference time its scale is fixed at) and, for gompertz, tau itself (the elapsed exposure time: the midpoint for an interval row, or the time of a known-time failure). mem is the empty string, because a memoryless baseline contributes nothing: h0(tau) = 1 and the hazard is M(T) alone.

Usage

brms_log_h0

Format

A named list, one expression string per baseline function of h0_catalogue.

Details

Each string is the baseline hazard on the log scale, not the density. For llogis the two differ by one log1p term: the hazard has a single - log1p(...), the density would have two.