Description Usage Arguments Details Value Required Data Rendered Equations Author(s) References See Also Examples

A harvest control rule proposed by Carl Walters that uses trajectory in inferred surplus production to make upward/downward adjustments to TAC recommendations

1 2 3 4 5 6 7 8 9 |

`x` |
A position in the data object |

`Data` |
A data object |

`reps` |
The number of stochastic samples of the MP recommendation(s) |

`plot` |
Logical. Show the plot? |

`yrsmth` |
The number of years over which to smooth catch and biomass data |

`gg` |
A gain parameter |

`glim` |
A constraint limiting the maximum level of change in quota recommendations |

The TAC is calculated as:

*\textrm{TAC} = \textrm{SP} ≤ft(1-gG\right)*

where *\textrm{SP}* is the predicted surplus production for the next year,
*g* is a gain parameter, and *G* is the slope of surplus production
as a function of biomass over the last `yrsmth`

years.

The change in TAC is bounded by the `glim`

argument, which by default does not allow
the TAC to decrease by more than half or increase more than twice the last annual catch.

An object of class `Rec`

with the `TAC`

slot populated with a numeric vector of length `reps`

See Data for information on the `Data`

object

`Gcontrol`

: Abun, Cat, Ind, Year

See Online Documentation for correctly rendered equations

C. Walters and T. Carruthers

Carruthers et al. 2015. Performance evaluation of simple management procedures. ICES J. Mar Sci. 73, 464-482.

Other Index methods:
`GB_slope()`

,
`GB_target()`

,
`ICI()`

,
`Iratio()`

,
`Islope1()`

,
`Itarget1_MPA()`

,
`Itarget1()`

,
`ItargetE1()`

1 | ```
Gcontrol(1, Data=DLMtool::Atlantic_mackerel, plot=TRUE)
``` |

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