Extends estimate beyond sampling frame

Infer estimates to parts of the fishery / target population that was not covered by sampling programs. That is strata not covered by the sampling frame, but that are known to be populated in census data (landing data). These are pragmatic approximations, without statistical justification.

Usage

ExtendAnalyticalSamplingFrameCoverage(
  AnalyticalPopulationEstimateData,
  StoxLandingData,
  StratificationVariables,
  Method = c("Strict", "SetToStratum"),
  UnsampledStratum = character(),
  SourceStratum = character()
)

Arguments

AnalyticalPopulationEstimateData: AnalyticalPopulationEstimateData with Estimates for the sampling frame
StoxLandingData: Landing data for the entire fishery / target population
StratificationVariables: vector of variables in StoxLandingData that should be used to partition the fishery, must be Stratification Variables in 'AnalyticalPopulationEstimateData'
Method: method of inference beyond sampling frame.
UnsampledStratum: name to use for unsamled stratum
SourceStratum: name of the stratum to get means and frequencies for the Method 'SetToStratum'

Value

AnalyticalPopulationEstimateData with parameters for unsampled stratum, and StratificationVariables reduced to those mathced with landings

Details

This function only infers precence of unsampled strata from census-data, and provide options for some pragmatic approximations to substitute for estimates for these strata. Any estimates already provided is not changed. The function does not introduce landed weights, or other knowledge from landings, except for the fact that strata are present in the landings data. All inference about unkown values are taken from the provided estimates ('AnalyticalPopulationEstimateData'). Subsequent ratio-estimation may make use of this information to also make use of total-weight information from landings (see link[RstoxFDA]{AnalyticalRatioEstimate}).

Inference about unkown values can be done in several ways, controled by the argument 'Method'

Strict: Provide NA-values for all parameters of all domains that is not in the sampling frame.
SetToStratum: Provide NA-values for abundance and total of all domains that is not in the sampling frame. Set means, frequencies, and corresponding variance to the same values as in a sampled strata.

For variables in 'StratificationVariables', any non-sampled landing partition will be added as one unsampled stratum with the name provided by 'UnsampledStratum'. Inferred statistics will be reported for all domains for this stratum.

Inference about unsampled strata is not justified by sampling. It may be considered applicable if the following applies:

Other considerations indicate that frequencies and means should be similar between the same domains in the unsampeld stratum and the source stratum.
The unsampled stratum will be agregated with sampled ones, and constitute a small volume compared to sampled strata. This can be inspected with ReportFdaSampling.

Usage

Arguments

Value

Details

See also