calcTheta: Calculate theta, the average exploitation rate on MMB...

In wStockhausen/rPIBKC: Package to run the PIBKC stock assessment

Calculate \theta, the average exploitation rate on MMB associated with discard mortality

Description

Function to calculate \theta, the average exploitation rate on MMB associated with discard mortality.

Usage

calcTheta(mmbLst, assYr = 2014, n = 3)

Arguments

mmbLst	output from calcMMBMating
assYr	assesssment year
n	number of years to include in average

Details

None.

Value

2-element vector with \theta calculated as

1. \theta = \frac{\sum_y M_{F_{y}}}{\sum_y MMB_{{fishing}_{y}}} ratio of averages

2. \theta = \frac{1}{N}\sum_y \frac{M_{F_{y}}}{{MMB}_{{fishing}_{y}})} average of ratios

where

• N = number of years over which to average

• M_{F_{y}} = total discard-related mortality on mature males in year y

• {MMB}_{{fishing}_{y}} = MMB just prior to the (pulse) fishery

wStockhausen/rPIBKC documentation built on April 25, 2023, 6:50 p.m.