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.

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? |

## Value

An object of class `Rec-class`

with the `TAC`

slot populated with a numeric vector of length `reps`

## 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
\(mc = \textrm{max}\left(\frac{5 + 25M}{100}, 0.2\right)\)

## 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

T. Carruthers

## Examples

#> TAC (median)
#> 1128.584