fishmethods (version 1.10-4)

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,
                    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

control

see control under function nls.

Value

List containing a summary of successful model fits and parameter estimates, standard deviation 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). The estimated parameters and their associated standard deviations are calculated as the mean and variance of the estimates from all bootstrap fits. The average parameter correlation matrix from all bootstrap fits is provided as well.

Examples

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