rgr: Relative Growth Rate (RGR)

In aquacultuR: A Comprehensive R Tool for Zootechnical Metrics

Relative Growth Rate (RGR)

Description

A function that calculates the Relative Growth Rate (RGR), which is the relative weight increase per time unit.

Usage

rgr(ibw, fbw, duration, mean_fun = "init")

Arguments

ibw	numeric; provides the initial weight in gram.
fbw	numeric; provides the final weight in gram.
duration	numeric; duration of the growth experiment.
mean_fun	character; specifies how ("init", "geometric" or "arithmetic") to calculate the denominator. Default: "init".

Value

either a single numeric value or vector holding the calculated RGR values. Multiply by 100 for conversion into percentage.

Author(s)

Anıl Axel Tellbüscher

References

Lugert, V., Thaller, G., Tetens, J., Schulz, C., & Krieter, J. (2016): A review on fish growth calculation: multiple functions in fish production and their specific application. Reviews in Aquaculture, 8, p.30–42.

Examples

data(weight2)
dplyr::mutate(weight2, RGR = rgr(ibw_g, fbw_g, duration = 84))

aquacultuR documentation built on Jan. 26, 2026, 5:07 p.m.