ref.bisect: Bisection approach to find target F for B (sex-structured)

In Henning-Winker/FLRef: Reference point computation for advice rules

Bisection approach to find target F for B (sex-structured)

Description

The plain bisection algorithm (Burden & Douglas, 1985) is employed here to find the value of a given forecast target quantity (e.g. 'fbar') for which a selected value of a performance statistic is obtained over a chosen period.

Usage

ref.bisect(
  stock,
  sr,
  deviances = rec(stock) %=% 1,
  metrics,
  refpts,
  statistic,
  years,
  pyears = years,
  tune,
  target = 1,
  tol = 0.01,
  maxit = 15,
  verbose = TRUE
)

Arguments

stock	object class FLStock
sr	object class FLSR
metrics	FLQuant of FLStock to be defined
statistic
years	years to be evaluated
tune	range for input x
target	target with default 1 for ratios
tol	tolerance level
maxit	number of optimisation steps
log	if TRUE, optimise on log-scale

Author(s)

Credits to Iago Mosqueira

References

Burden, Richard L.; Faires, J. Douglas (1985), "2.1 The Bisection Algorithm", Numerical Analysis (3rd ed.), PWS Publishers, ISBN 0-87150-857-5

Henning-Winker/FLRef documentation built on June 12, 2025, 1:41 a.m.