| ITM {DLMtool} | R Documentation |
Index Target based on natural mortality rate
Description
An index target MP where the TAC is modified according to current index levels (mean index over last number of years determined by natural mortality (M)) relative to a target level.
Usage
ITM(x, Data, reps = 100, plot = FALSE)
Arguments
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? |
Details
The TAC is caluclated as:
\textrm{TAC}_y = \textrm{TAC}_{y-1} \delta I
where \delta I is the ratio of the mean index over 4\frac{1}{M}^{1/4} years
to the reference index (Data@Iref).
The maximum fractional change in TAC is determined by mc, defined as
mc = \textrm{max}\left(\frac{5 + 25M}{100}, 0.2\right)
Value
An object of class Rec-class with the TAC slot populated with a numeric vector of length reps
Required Data
See Data-class for information on the Data object
ITM: Ind, Iref, MPrec, Mort
Rendered Equations
See Online Documentation for correctly rendered equations
Author(s)
T. Carruthers
Examples
ITM(1, Data=MSEtool::SimulatedData, plot=TRUE)