q.correct.f: Determine length based catchability by fish morphotype

In duplisea/size: Size based indicators for the northern Gulf of St Lawrence groundfish survey

Description

A logistic curve parameterised on assessment results from nGSL selectivity curves as well as literature

Usage

q.correct.f(L, alpha, beta, gamma)

Arguments

L	length of the individual, cm
alpha	length at q=0.5
beta	the slope of the logistic curve
gamma	the asymptote of the logistic curve
morpho.group	a morpho-group designation for each species which describes the body form and preferred habitat as a means of q correcting the abundance index

References

Harley, S.J. and Myers, R.A., 2001. Hierarchical Bayesian models of length-specific catchability of research trawl surveys. Canadian Journal of Fisheries and Aquatic Sciences 58: 1569-1584.

duplisea/size documentation built on Sept. 11, 2019, 11:05 a.m.