calc_ref: Per recruit calculation and spawning potential ratio

In merrillrudd/LIME: Length-based Integrated Mixed Effects (LIME) assessment method

Description

calc_ref Calculates derived spawning potential ratio: lifetime total egg production in fished:unfished states

Usage

<<<<<<< HEAD
calc_ref(ages, Mat_a, W_a, M, F, S_fa, ref = FALSE, fleet_prop = 1,
  type = "SPR")

Arguments

ages	vector of ages
Mat_a	from report file / true file for simulation
W_a	from report file / true file for simulation
M	from report file / true file for simulation
F	proposed F to calculate reference point, if S_fa has more than 1 fleet, requires F as a vector, one for each fleet
S_fa	selectivity by fleet by age
ref	FALSE outputs SPR, ref= a value between 0 and 1 can be used with uniroot to find the F at which SPR=ref
fleet_prop	fleet proportions
type	option spawning biomass per recruit (SPR) or biomass per recruit ("Depletion")

Details

Use this function with uniroot to find the value of F that results in SPR matching the specified reference value (e.g. 0.30 to find F30)

Value

List, a tagged list of potentially useful benchmarks

Author(s)

M.B. Rudd

merrillrudd/LIME documentation built on June 20, 2020, 2:58 p.m.