Start values for the logit-hazard parameterisation

Builds a named list of starting values for fitdistdoublecens() with distr = "discretehazard". The free parameters are the logit intercept alpha, the log random-walk (or random-effect) scale log_sigma, and the K - 1 innovations eps_1, ..., eps_{K-1}. The final bin hazard is pinned to 1 inside the parameterisation so the implied PMF sums to 1.

Usage

discretehazard_start(K, alpha = -2, log_sigma = log(1), eps = 0)

Arguments

K

Integer, number of bins in the hazard parameterisation.

alpha

Numeric, start value for the logit intercept.

log_sigma

Numeric, start value for the log scale.

eps

Numeric, scalar or length-K - 1 vector of start values for the innovations eps_1, ..., eps_{K-1}.

Value

Named list suitable for the start argument of fitdistdoublecens().

See also

Other pdiscretehazard: ddiscretehazard(), pdiscretehazard(), rdiscretehazard()

Examples

discretehazard_start(K = 5)
#> $alpha
#> [1] -2
#> 
#> $log_sigma
#> [1] 0
#> 
#> $eps_1
#> [1] 0
#> 
#> $eps_2
#> [1] 0
#> 
#> $eps_3
#> [1] 0
#> 
#> $eps_4
#> [1] 0
#>