LBSPR_NLLabsel {LBSPR}

LBSPR Optimization function for age-based selectivity model

Description

Internal optimization function

Usage

LBSPR_NLLabsel(
  starts,
  x,
  P,
  LMids,
  LBins,
  LDat,
  MK,
  Linf,
  FecB,
  L50,
  L95,
  maxsd,
  CVLinf,
  Nage,
  usePen
)

Arguments

starts

a vector of starting parameters, relative SL50 (SL50/Linf), deltaSL (SL95-SL50)/Linf, and F/M (in log space)

x

vector of relative ages

P

numeric value indicating proportion of cohort remaining at maximum age

LMids

a vector of the midpoints of the length classes

LBins

a vector of length classes

LDat

a vector of lenght frequencies. Must be same length as LMids

MK

the M/K value

Linf

the Linf value for the population as a hole

FecB

exponent of the length-fecundity relationship

L50

length at 50 per cent maturity

L95

length at 95 per cent maturity

maxsd

numeric value - maximum number of standard deviations of length-at-age dist

CVLinf

CV of length-at-age

Nage

number of pseudo age-classes

usePen

logical to use penalty for extreme estimates of selectivity

Value

negative log-likelihood value

Author(s)

A. Hordyk