idx.sim: generates FLIndex with lognormal annual and multinomial age...
In Henning-Winker/FLRef: Reference point computation for advice rules

idx.sim

R Documentation

generates FLIndex with lognormal annual and multinomial age composition observation error

Description

generates FLIndex with lognormal annual and multinomial age composition observation error

Usage

idx.sim(
  object,
  sel = catch.sel(object),
  ages = NULL,
  years = NULL,
  ess = 200,
  sigma = 0.2,
  q = 0.01
)

Arguments

`object`	FLStock
`sel`	FLQuant with selectivity.pattern
`ages`	define age range
`years`	define year range
`ess`	effective sample size for age composition sample
`sigma`	annual observation error for log(q)
`q`	catchability coefficient for scaling

Value

FLIndex

Examples

data(ple4)
sel = newselex(catch.sel(ple4),FLPar(S50=1.5,S95=2.1,Smax=4.5,Dcv=1,Dmin=0.1))
ggplot(sel)+geom_line(aes(age,data))+ylab("Selectivity")+xlab("Age")
object = propagate(ple4,10)
idx = idx.sim(object,sel=sel,ess=200,sigma=0.2,q=0.01,years=1994:2017)
# Checks
ggplot(idx@sel.pattern)+geom_line(aes(age,data))+ylab("Selectivity")+xlab("Age")
ggplot(idx@index)+geom_line(aes(year,data,col=ac(iter)))+facet_wrap(~age,scales="free_y")+
theme(legend.position = "none")+ylab("Index")

Henning-Winker/FLRef documentation built on Dec. 16, 2024, 7:23 p.m.