Description Usage Arguments Details Value Functions Required Data Rendered Equations Author(s) Examples
An index target MP where the TAC is modified according to current index levels (mean index over last 5 years) relative to a target level.
1 2 3 
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 historical years over which to average the index 
mc 
The maximum fractional change in the TAC among years. 
The TAC is calculated as:
\textrm{TAC}_y = C_{y1} I_δ
where C_{y1} is the catch from the previous year and I_δ is
the ratio of the mean index over the past yrsmth
years to a reference index level.
The maximum allowable change in TAC is determined by mc
: e.g mc=0.05
means that the maximum change in TAC from the previous
catch is 5%.
The reference index level ([email protected]
) is assumed to be a proxy for MSY. In the
MSE Iref
is the index at MSY subject to observation error ([email protected]
).
Consequently the performance of these methods in MSE is strongly determined by the
uncertainty the in reference index.
An object of class Rec
with the TAC
slot populated with a numeric vector of length reps
IT5
: Maximum annual changes in TAC are 5 per cent.
IT10
: Maximum annual changes are 10 per cent.
See Data for information on the Data
object
IT5
: Ind, Iref, MPrec
IT10
: Ind, Iref, MPrec
See Online Documentation for correctly rendered equations
T. Carruthers
1 2  IT5(1, DLMtool::SimulatedData, plot=TRUE)
IT10(1, DLMtool::SimulatedData, plot=TRUE)

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