Additional families

Additional families compatible with tinyVAST().

Usage

delta_lognormal(link1, link2 = "log", type = c("standard", "poisson-link"))

delta_gamma(link1, link2 = "log", type = c("standard", "poisson-link"))

Arguments

link1

Link for first part of delta/hurdle model.

link2

Link for second part of delta/hurdle model.

type

Delta/hurdle family type. "standard" for a classic hurdle model. "poisson-link" for a Poisson-link delta model (Thorson 2018).

link

Link.

Value

A list with elements common to standard R family objects including family, link, linkfun, and linkinv. Delta/hurdle model families also have elements delta (logical) and type (standard vs. Poisson-link).

References

Poisson-link delta families:

Thorson, J.T. 2018. Three problems with the conventional delta-model for biomass sampling data, and a computationally efficient alternative. Canadian Journal of Fisheries and Aquatic Sciences, 75(9), 1369-1382. doi:10.1139/cjfas-2017-0266

Examples

delta_lognormal()
#> 
#> Family: binomial lognormal 
#> Link function: log log 
#> 
delta_gamma()
#> 
#> Family: binomial Gamma 
#> Link function: logit log 
#>