AmountByGroup function

[erosquesada]

output from WGRDBES-EST 2023.

This functions requires the user to specify a variable of interest and produce a barplot.
The function allows to treat landing, effort and sampling data.
The user can addionally add one or more grouping variable.
Parameters of the functions:

RDBESobj = RDBESobject to be explored.
var = Variable of interest (to be plotted).
by = One (or more) factor(s) to split the data.
year = year(s) to filter the data.
output_type: one of (table | plot).

The output of the function depends on the user selection. We see three main group of outputs depending on the nature of the data to be visualized.

• Effort: if the user chooses effort related columns, the function can represent hours, days at sea, power (kW), number of trips, etc… . Possible splitting variables are in this case: area, metier, vessel length, quarter.

• Landing: if the user chooses landing related columns, the function can represent weight and value.
  Possible splitting variables are in this case: area, metier, vessel length, species (group of species?), catch category (LAN, REGDIS, BMS), landing country.

• Sampling: if the user chooses sampling data, the function can represent

  i. n trips
  ii. n samples
  iii. n auction days
  iv. n species sampled
  v. n individuals sampled

Possible splitting variables are in this case: Species, Area[ICES Division, ICES Sd., ICES Rect], Time [Year, Semester, Quarter, Month].