fishmethods (version 1.11-2)

clus.vb.fit: Fit a Von Bertalanffy growth equation to clustered data via bootstrapping

Description

Fits the von Bertalanffy growth equation to clustered length and age by using nonlinear least-squares and by bootstrapping clusters

Usage

clus.vb.fit(len = NULL, age = NULL, cluster = NULL, nboot = 1000,
sumtype = 1, control = list(maxiter=10000, minFactor=1/1024,tol=1e-5))

Arguments

len

vector of lengths of individual fish

age

vector of ages of individual fish

cluster

haul or cluster membership identifier

nboot

number of bootstrap samples

sumtype

use 1 = mean or 2 = median of bootstrap runs as the parameter and correlation coefficients values. Default is 1.

control

see control under function nls.

Value

List containing a summary of successful model fits and parameter estimates, standard errors and 95 percent confidence intervals, and the average correlation matrix.

Details

A standard von Bertalanffy growth curve is fitted to length-at-age data of each nboot sample of clusters using nonlinear least-squares (function nls). Standard errors are calculated using function sd applied to bootstrap parameters.

Examples

# NOT RUN {
  
# }
# NOT RUN {
	data(pinfish)
	with(pinfish,clus.vb.fit(len=sl,age=age,cluster=field_no,nboot=100))
  
# }