Calculate the number of observations by year and strata

Provides a summary of total and positive tows across different strata and years to help evaluate the suitability of the selected stratification.

Usage

check_strata(
  data,
  strata,
  dir = NULL,
  printfolder = lifecycle::deprecated(),
  verbose = TRUE
)

Arguments

data: Data frame of catch data created by pull_catch().
strata: A data frame that defines the strata and provides the calculated areas for each strata returned from create_strata().
dir: Directory where output will be saved. The directory where the file should be saved. If dir = NULL no output will be saved.
printfolder: Deprecated with nwfscSurvey 2.8.0 to give users greater control on where to save files. A string that will be appended to dir, creating a folder where the output will be saved.
verbose: A logical that specifies if you want to print messages and warnings to the console. The default is TRUE.

Value

A matrix containing the total number of tows and positive tows cross-tabulated by year and strata.

Details

Calculates and returns the total number of tows and positive tows conducted in each strata by year. The selected strata are used to expand the length and marginal age compositions and to calculate a design-based index using get_design_based().

In earlier versions of the code, more than one positive observation within each strata was required to calculate a design-based index. The current get_design_based() function is more robust and returns zeros in strata-year combinations with no observations. However, reviewing the frequency of tows and positive tows is recommended to ensure that the selected strata are reasonable (e.g., avoiding limited observations in large areas).

Author