Calculate the number of observations by year and strata
check_strata.RdCalculate the number of observations by year and strata
Arguments
- data
Data frame of catch data that has been created by the
pull_catch().- strata
A data frame that defines the strata and provides the calculated areas for each strata returned from
createStrataDF.fn().- dir
Directory where output will be saved. The directory where the file should be saved. If dir = NULL no output will be saved.
- printfolder
A string that will be appended to
dir, creating a folder where the output will be saved. If specified as"", the output will just be saved directly indir. The default is"forSS3".- verbose
A logical that specifies if you want to print messages and warnings to the console. The default is
TRUE.
Value
A matrix with the number of tows and positive tows within each strata by year and the number of positive tows by strata and year.
Details
Calculates and returns the total number of tows and
positive tows conducted in each strata by year. The
selected stratas are used to expand the length and
marginal age compositions and to calculate a design
based index using the get_design_based(). In earlier
versions of the code, there needed to be more than one
positive observations within each strata to calculate
a design based index using Biomass.fn(). The new
get_design_based() function is more robust and will
return zeros in each strata-year combination with no
observations. However, it can be useful to review how
many tows and positive tows are present by year and
strata in your data to ensure that the selected strata
for expanding the data is reasonable (e.g., avoiding
limited observations in large areas).