getCpue_relative: Get the relative catch per unit effort (cpue)
In imarpe/imarpe: Tools for graphics and summary reports for IMARPE

Description Usage Arguments Details Value Author(s) Examples

Get the relative catch per unit effort (cpue)

1 2	getCpue_relative(data, toTons = FALSE, efforType, cpueBy = "time", timeBy, fleeType = NULL)

`data`	A `data.frame` with information about catchs and fishing effort.
`toTons`	A logical parameter. `TRUE` (dafault) it assume that the catches is in kilograms and converts it into tonnes (divided by 1000). `FALSE` it assume the the information is in tons and don't convert the data.
`efforType`	A `character` indicating the fishing effort type. It could be four types: travelTime for the effort as a function of the travel time. haulTotal for the effort as a function of the total number of fishing haul. storageCapacity for the effort as a function of the storage capacity. searchTime for the effort as a function of the search time to catch the species.
`cpueBy`	Parameter to indicate whether the relative cpue will be estimated by time (`cpueBy = time`) or by port (`cpueBy = port`).
`timeBy`	If the relative cpue is estimated over the time, it could be by days (`timeBy = days`), months (`timeBy = months`), years (`timeBy = years`) or by seasons (`timeBy = seasons`).
`fleeType`	The relative cpue could be estimated for the whole data given or for a data by fleeType. By default this parameter is `NULL`.

The relative cpue is a index used on bitacora report.

A vector with the relative cpue.

Criscely Lujan-Paredes, criscelylujan@gmail.com.

# Read a example of data base
bitacoraData = system.file("extdata", "bitacoraData.csv", package = "imarpe")

# Create a object of bitacora class
bitacoraObject = getBitacoraData(file = bitacoraData)

# Get the results
mainBitacoraData = getMainResults.bitacora(object = bitacoraObject, language = "spanish",
specie = "anchoveta", effortData = TRUE)

# Effort data
effortData = mainBitacoraData$effortData

# Filter data: anchovy data for anchovy and the north-central region
effortNC = effortSpeciesData.bitacora(data = effortData, species = "anchoveta", region = "norte-centro")

# Get the cpue relative
getCpue_relative(data = effortNC, efforType = "travelTime", cpueBy = "port")
getCpue_relative(data = effortNC, efforType = "travelTime", cpueBy = "time", timeBy = "months")