fishmethods: cpuekapp – R documentation

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cpuekapp

Trawl survey based abundance estimation using data sets with unusually large catches

Description

Calculates the mean cpue after replacing unusually large catches with expected values using the method of Kappenman (1999)

Usage

cpuekapp(x = NULL, nlarge = NULL, absdif = 0.001)

Arguments

`x`	vector of non-zero trawl catch data.
`nlarge`	the number of values considered unusually large.
`absdif`	convergence tolerance

Details

Use function gap to choose the number of unusually large values.

Value

`kappmean`	list element containing new arithmetic mean.
`expectations`	list element containing the original observation(s) and expected order statistic(s).

Author(s)

Gary A. Nelson, Massachusetts Division of Marine Fisheries gary.nelson@mass.gov

References

Kappenman, R. F. 1999. Trawl survey based abundance estimation using data sets with unusually large catches. ICES Journal of Marine Science. 56: 28-35.

Examples

## Not run: 
  ## Data from Table 1 in Kappenman (1999)
  data(kappenman)
  cpuekapp(kappenman$cpue,1)
 
## End(Not run)

fishmethods

Fishery Science Methods and Models

v1.11-1

GPL (>= 2)

Authors

Gary A. Nelson <gary.nelson@mass.gov>

Initial release

2019-12-13