
The MP adjusts catch based on the value of the index in the current year relative to the time series mean and standard error.
ICI(x, Data, reps = 100, plot = FALSE)ICI2(x, Data, reps = 100, plot = FALSE)
A position in the data object
A data object
The number of stochastic samples of the MP recommendation(s)
Logical. Show the plot?
An object of class Rec
with the TAC
slot populated with a numeric vector of length reps
ICI
: The catch is reduced by 0.75 if the Z-score of the current year's index is less than -0.44.
The catch is increased by 1.05 if the Z-score of the current year's index is greater than 1.96. Otherwise, the catch is held constant.
ICI2
: This method is less precautionary of the two ICI MPs by allowing for a
larger increase in TAC and a lower threshold of the index to decrease the TAC. The catch is reduced by 0.75
if the Z-score of the current year's index is less than -1.96. The catch is increased by 1.25
if the Z-score of the current year's index is greater than 1.96. Otherwise, the catch is held constant.
See Online Documentation for correctly rendered equations
The TAC is calculated as:
ICI
and ICI2
,
ICI
and ICI2
respectively, and
Ernesto Jardim, Manuela Azevedo, Nuno M. Brites, Harvest control rules for data limited stocks using length-based reference points and survey biomass indices, Fisheries Research, Volume 171, November 2015, Pages 12-19, ISSN 0165-7836, https://doi.org/10.1016/j.fishres.2014.11.013
Other Index methods: GB_slope
,
GB_target
, Gcontrol
,
Iratio
, Islope1
,
Itarget1_MPA
, Itarget1
,
ItargetE1
# NOT RUN {
ICI(1, Data=DLMtool::Atlantic_mackerel, plot=TRUE)
ICI2(1, Data=DLMtool::Atlantic_mackerel, plot=TRUE)
# }
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