CDS function definition
Creates model formula list for conventional distance sampling using values
supplied in call to ddf
cds( key = NULL, adj.series = NULL, adj.order = NULL, adj.scale = "width", adj.exp = FALSE, formula = ~1, shape.formula = ~1 )
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 |
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 |
Jeff Laake; Dave Miller
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