Fpa: Fpa from Flim

In icesAdvice: Functions Related to ICES Advice

Fpa from Flim

Description

Calculate the value of Fpa from Flim and sigmaF.

Usage

Fpa(Flim, sigmaF)

Arguments

Flim	the value of the Flim reference point.
sigmaF	the estimation uncertainty in F (standard error of logF in the terminal year).

Value

Value of Fpa.

Note

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:

Fpa = Flim * exp(-1.645*sigmaF)

The Fpa function can also be used to calculate reference points based on harvest rate: Hpa from Hlim and sigmaH.

Author(s)

Arni Magnusson.

References

ICES (2017) ICES fisheries management reference points for category 1 and 2 stocks. doi: 10.17895/ices.pub.3036ICES Advice Technical Guidelines 12.4.3.1.

See Also

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.

Examples

Fpa(0.90, 0.15)

icesAdvice documentation built on March 18, 2022, 6:19 p.m.