ct_fit_detmodel: Fit animal detection

In ct: Camera Trap Data Management and Multi-Method Ecological Analysis

Fit animal detection

Description

Fits a detection function (either point or line transect) to model detection radius or angle.

Usage

ct_fit_detmodel(
  formula,
  data,
  newdata = NULL,
  unit = c("m", "km", "cm", "degree", "radian"),
  ...
)

Arguments

formula	A formula specifying the response (e.g., radius ~ 1 or angle ~ covariate).
data	A data frame containing detection observations.
newdata	Optional new data frame with covariate values for prediction.
unit	Unit of the detection variable. One of "m", "km", "cm" for distance, or "degree", "radian" for angle.
...	Additional arguments passed to Distance::ds().

Value

a list with elements:

• ddf a detection function model object.

• dht abundance/density information (if survey region data was supplied, else NULL)

See Also

ct_fit_rem(), ct_fit_speedmodel(), ct_fit_activity()

Examples

data("ctdp")
observations <- ctdp$data$observations %>%
  dplyr::filter(scientificName == "Vulpes vulpes")


ct_fit_detmodel(radius ~ 1, data = observations)


# For angle
ct_fit_detmodel(angle ~ 1, data = observations)

ct documentation built on Oct. 22, 2026, 1:07 a.m.