modlike: This function calculates negative log-liklihood for a habitat...

In rooperc4/MEHRSI: Habitat Model Estimates of Survey Abundances

Description

This function takes observed and predicted CPUE and calculates a negative log-likelhood for the data it uses either a log-normal or gamma distribution. The model form, parameters, habitat variables, presence or absence and year are passed through this function to the HabModel function which computes the predicted values. It accepts "normal" or "gamma" as arguments for distribution.

Usage

modlike(par, form, variables, ob_CPUE, pred_pa = 1, year,
  distribution = "normal")

Arguments

par	values for each of the parameters
form	for each variable, a form for the model equation (1, 2 or 3)
variables	Set of habitat variables to use in the modeling
ob_CPUE	Observed CPUE at the transect
pred_pa	Predicted presence or absence at the transect
year	Set of habitat variables to use in the modeling
distribution	Either "normal" (the default) or "gamma"

Examples

modlike()

rooperc4/MEHRSI documentation built on May 21, 2019, 9:35 a.m.