mobw.kg {CatDyn} | R Documentation |
Mean body weight per month
Description
Using a data.frame with paired observations of length and weight of individuals, and a second data.frame with paired observations of length and month of individuals, predict the mean weight per month in kg and its standard error.
Usage
mobw.kg(par, lenw, lenm, method, span)
Arguments
par |
Numeric vector length 2 with the initial values for parameters of the length-weight relationship. |
lenw |
Numeric data.frame with paired observations of length and weight (kg). |
lenm |
Numeric data.frame with paired observations of length and month in numeric format. |
method |
Character, the numerical method to fit the length-weight relationship. Use one of the following: BFGS,CG,Nelder-Mead,SANN. |
span |
The span parameter of the loess function to fit the length-month relationship. |
Details
The length data in lenw and lenm must be in the same units.
Value
A data.frame with five columns: month, predicted mean weight from the length data and the length-weight relationship, its standard error, smoothed mean length from the loess fit of the length-month relationship, and its standard error.
Author(s)
Ruben H. Roa-Ureta (ORCID ID 0000-0002-9620-5224)
Examples
data(gayhakelm)
data(gayhakelw)
par <- c(4e-4,2.9)
method <- "SANN"
span <- 1
chihake.mobw <- mobw.kg(par=par, lenw=gayhakelw, lenm=gayhakelm,
method=method, span=span)