surveyIndex: Get Survey Biomass Index

In hafroAssmt: Hafro Assessment Toolbox

Description

Extract survey biomass index series from aggrVisit dataframe, for a given species, size group, and survey.

Usage

surveyIndex(tegund, lengd=NULL, sur="smb", div=1, data=aggrVisit)

Arguments

tegund	species name, like "ufsi".
lengd	minimum length group to include in the biomass index, or NULL to include all lengths.
sur	survey name, either "smb" or "smh".
div	denominator to shorten biomass index.
data	main dataframe, like aggrVisit.

Value

Dataframe with eight columns:

ar	year
bio.staerri	biomass index
cv.bio.staerri	cv
svaedi	area
svaedisnr	area code
lengd	length
tegund	species
sur	survey name

Author(s)

Arni Magnusson.

See Also

[ is used to extract the relevant rows and columns.

hafroAssmt-package gives an overview of the package.

Examples

aggrDemo <- data.frame(fj=0, cv.fj=NA,
                       bio.staerri=round(1e5*exp(rnorm(36,sd=0.3)),1),
                       cv.bio.staerri=round(runif(36,0.05,0.5),3),
                       fj.minni=0, cv.fj.minni=NA, fj.haenga=0,
                       cv.fj.haenga=NA, fj.hrygna=0, cv.fj.hrygna=NA,
                       svaedi=c("N","S","Heild"), svaedisnr=13:15,
                       lengd=rep(7:9,each=3), ar=rep(2001:2004,each=9),
                       bio=0, tegund="daemi", sur="smb")
surveyIndex("daemi", data=aggrDemo)
surveyIndex("daemi", data=aggrDemo, div=1e3)

## Typical usage requires aggrVisit:
##
## surveyIndex("ufsi", 55)

hafroAssmt documentation built on May 2, 2019, 5:47 p.m.