fishmethods (version 1.12-1)

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)

Value

kappmean

list element containing new arithmetic mean.

expectations

list element containing the original observation(s) and expected order statistic(s).

Arguments

x

vector of non-zero trawl catch data.

nlarge

the number of values considered unusually large.

absdif

convergence tolerance

Author

Gary A. Nelson, Massachusetts Division of Marine Fisheries

Details

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

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.

See Also

gap

Examples

 if (FALSE) {
  ## Data from Table 1 in Kappenman (1999)
  data(kappenman)
  cpuekapp(kappenman$cpue,1)
 }