Fpa | R Documentation |
Calculate the value of Fpa from Flim and sigmaF.
Fpa(Flim, sigmaF)
Flim |
the value of the Flim reference point. |
sigmaF |
the estimation uncertainty in F (standard error of logF in the terminal year). |
Value of Fpa.
The purpose of PA reference points is to apply a precautionary approach in fisheries management.
By comparing the current F to Fpa, one can answer the question: are we at least 95% sure that F is below Flim, given the estimation uncertainty?
The ICES (2017) technical guidelines define Fpa as:
F_\mathrm{pa} = F_\mathrm{lim} \exp(-1.645\sigma_F)
The Fpa
function can also be used to calculate reference points based
on harvest rate: Hpa from Hlim and sigmaH.
Arni Magnusson.
ICES (2017). ICES fisheries management reference points for category 1 and 2 stocks. ICES Advice Technical Guidelines 12.4.3.1. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.17895/ices.pub.3036")}.
Bpa
calculates that reference point from Blim and sigmaB.
sigmaPA
calculates the implicit sigma from PA reference points.
icesAdvice-package
gives an overview of the package.
Fpa(0.90, 0.15)
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