cds: CDS function definition

In mrds: Mark-Recapture Distance Sampling

CDS function definition

Description

Creates model formula list for conventional distance sampling using values supplied in call to ddf

Usage

cds(
  key = NULL,
  adj.series = NULL,
  adj.order = NULL,
  adj.scale = "width",
  adj.exp = FALSE,
  formula = ~1,
  shape.formula = ~1
)

Arguments

key	string identifying key function (currently either "hn" (half-normal),"hr" (hazard-rate), "unif" (uniform) or "gamma" (gamma distribution)
adj.series	string identifying adjustment functions cos (Cosine), herm (Hermite polynomials), poly (simple polynomials) or NULL
adj.order	vector of order of adjustment terms to include
adj.scale	whether to scale the adjustment terms by "width" or "scale"
adj.exp	if TRUE uses exp(adj) for adjustment to keep f(x)>0
formula	formula for scale function (included for completeness only only formula=~1 for cds)
shape.formula	formula for shape function

Value

A formula list used to define the detection function model

fct	string "cds"
key	key function string
adj.series	adjustment function string
adj.order	adjustment function orders
adj.scale	adjustment function scale type
formula	formula for scale function
shape.formula	formula for shape function

Author(s)

Jeff Laake; Dave Miller

mrds documentation built on July 9, 2023, 6:06 p.m.