SAR_cat: SAR_cat

In PAskey/SPDT: Stocking Product Development Team analyses (SPDT)

SAR_cat

Description

A function to partition release sizes into discrete categories

Usage

SAR_cat(SAR)

Arguments

SAR	a number or vector of fish release sizes (in g or other sizes)

Details

This function takes a number (release size) and assigns it to another number category. This is useful since a difference of 1g between stocking groups is a big deal for a 1g fry release size, but a rounding error for large yearlings. A default set of categories has been created. The function may be updated to offer options in the future. A simple manual alternative is round(a/b)*a where a is value and b is the rounding increment.

SAR_cat = dplyr::case_when(SAR<=5.5 ~ cround(SAR/1)*1, SAR>5.5&SAR<=22.5 ~ cround(SAR/5)*5, SAR>22.5&SAR<75 ~ cround(SAR/10)*10, TRUE ~ cround(SAR/20)*20)

Additional note is that R rounds 0.5 value up or down every second digit (e.g. 1.5 = 2, 2.5 = 2, 3.5 = 4, etc.). Apparently, this is some sort of standard but is problematic when categorizing release sizes (1.5 and 2.5 are both put into 2.) Therefore, a custom function to correct this to always round 0.5 up is used (cround()).

Examples

Must be connected to VPN if working remotely


#Create a vector of size-at-release values - SARs
SARs = c(1:100)

#Re-categorize these into broader size bins depending on sizes. 
Default bins based on common release sizes and release size targets.
SAR_cat = SAR_cat(SARs)
SAR_cat

PAskey/SPDT documentation built on May 31, 2024, 12:21 a.m.