Create a fixed margin from a stats distribution

stats_margin() adapts the univariate distributions documented in stats::Distributions to the fitted-margin protocol. Distribution parameters are supplied through ...; the resulting margin reports the distribution's parameter count but has no fitted log-likelihood.

Usage

stats_margin(family, ...)

Arguments

family

distribution suffix such as "norm", "pois", or "binom".

...

parameters passed to the distribution's density, CDF, and quantile functions.

Value

A fixed margin implementing the margin protocol.

Examples

normal <- stats_margin("norm", mean = 1, sd = 2)
poisson <- stats_margin("pois", lambda = 3)
margin_info(normal)
#> $family_name
#> [1] "norm"
#> 
#> $type
#> [1] "c"
#> 
#> $support
#> [1] -Inf  Inf
#> 
#> $npars
#> [1] 2
#> 
#> $loglik
#> [1] NA
#> 
margin_info(poisson)
#> $family_name
#> [1] "pois"
#> 
#> $type
#> [1] "d"
#> 
#> $support
#> [1]   0 Inf
#> 
#> $npars
#> [1] 1
#> 
#> $loglik
#> [1] NA
#>