Bpa: Bpa from Blim

In arnima-github/icesAdvice: Functions Related to ICES Advice

Bpa from Blim

Description

Calculate the value of Bpa from Blim and sigmaB.

Usage

Bpa(Blim, sigmaB)

Arguments

Blim	the value of the Blim reference point.
sigmaB	the estimation uncertainty in B (standard error of logSSB in the terminal year).

Value

Value of Bpa.

Note

The purpose of PA reference points is to apply a precautionary approach in fisheries management.

By comparing the current B to Bpa, one can answer the question: are we at least 95% sure that B is above Blim, given the estimation uncertainty?

The ICES (2017) technical guidelines define Bpa as:

B_\mathrm{pa} = B_\mathrm{lim} \exp(1.645\sigma_B)

Author(s)

Arni Magnusson.

References

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")}.

See Also

Fpa calculates that reference point from Flim and sigmaF.

sigmaPA calculates the implicit sigma from PA reference points.

icesAdvice-package gives an overview of the package.

Examples

Bpa(100, 0.15)

arnima-github/icesAdvice documentation built on Oct. 28, 2023, 10:19 a.m.