fit.lw: fit log length-weight relationship by year or period

In iml-assess/catchR: Analyse catch data and get catch-at-age matrices

fit log length-weight relationship by year or period

Description

fit log length-weight relationship by year or period

Usage

fit.lw(
  length,
  weight,
  year = 1,
  period = 1,
  tresh = 150,
  period.unit = c("month", "quarter"),
  regression = c("robust", "ols")
)

Arguments

length	vector of lengths (log scale)
weight	vector of weights (log scale)
year	vector of years
period	vector of periods
tresh	minimum number of observations
regression	type of regression (ols or rubust)
interval	period is month or quarter?

Details

find lenght weight-relationships for all possible combinations of years and periods. Works with a minimal threshold for individuals needed, and if not attained 1) looks for data in nieghbouring months and 2) uses data for the entire year returns coefficients, bias correction factor for use log scale , number of observations and the option used to get enough observations RObuust regression by default (lts). lms and ordinary ls also possible. See MASS package for details

iml-assess/catchR documentation built on Nov. 27, 2022, 7:35 p.m.