Bpa {icesAdvice}

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. doi: 10.17895/ices.pub.3036ICES Advice Technical Guidelines 12.4.3.1.

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)