cochran.trans.calc: Estimate the in-season cumulative discard with a transition...

In noaa-garfo/discaRd: Cochran bycatch estimation

Estimate the in-season cumulative discard with a transition rate

Description

Apply transition rate to adjust in-season discard rate estimates and calculate the cumulative discard for a set of trips and observed trips, according to a strata definition

Usage

cochran.trans.calc(
  bydat_focal,
  trips_focal,
  bydat_prev,
  trips_prev,
  strata_name = "STRATA",
  strata_complete = NULL,
  time_span = c(1, 365),
  time_inter = 1,
  CV_target = 0.3,
  trans_method = c("ntrips", "ntripsCV", "moving", "none")[1],
  trans_num = 5,
  trans_numCV = FALSE
)

Arguments

bydat_focal	Observed trips for focal year (t)
trips_focal	Trips from DMIS for focal year (t)
bydat_prev	Observed trips for previous year (t-1)
trips_prev	Trips from DMIS for previous year (t-1)
strata_name	Name of the stratification column (default = "STRATA")
strata_complete	Vector of complete names for all strata of interest
time_span	Start and end days of the fishing season
time_inter	The length of the time interval for cumulative calculation (default = 1 day)
trans_method	Method for incorporating the transition rate, either using a minimum number of trips specified [default] or determined by previous year's CV, a moving window, or no transition.
trans_num	Number used by the trans_method for determining transition, either number of trips (trans_method='ntrips')
trans_numCV	Option to output the number of days in transition for

Details

Each data frame input MUST have matching stratification columns. This variable may be numeric, logical, factor or character. The cumulative rate can be calculated without any transition rate by using method = "none".

Value

A list of Cochran estimates by strata, Discards, Total Discard in the fishery (adjusted by transition rate)

See Also

get.cochran.ss.by.strat

Examples

cochran.trans.calc

noaa-garfo/discaRd documentation built on April 17, 2025, 10:32 p.m.