getaav: getaav calculates annual absolute variation in catch

In haddonm/rforcpue: Functions to Assist With The Analysis of CPUE Data

getaav calculates annual absolute variation in catch

Description

getaav calculates the annual absolute change in catch for an input vector of catches, which could be across a series of years or even across different spatial units for a single year (an unusual use). The equation used is aav = 100 x sum(|Ct - Ct-1|)/(sum(Ct).

Usage

getaav(invect, narm = TRUE)

Arguments

invect	a vector of catches
narm	boolean, should NAs be removed? If not then getaav will return an NA. Default = TRUE

Value

a single scalar value the AAV of the input catches

Examples

  catch <- c(1,2,3,4,5,4,3,2,1)
  getaav(catch)  # should equal 0.32

haddonm/rforcpue documentation built on Oct. 12, 2024, 11:55 p.m.