Functions to estimate the density and size of a spatially
distributed animal population sampled with an array of passive detectors,
such as traps, or by searching polygons or transects. Models incorporating
distance-dependent detection are fitted by maximizing the likelihood.
Tools are included for data manipulation and model selection.
| Version: |
5.4.2 |
| Depends: |
R (≥ 3.5.0), methods |
| Imports: |
secrfunc, abind, graphics, grDevices, MASS, mgcv, mvtnorm, nlme, parallel, raster (≥ 3.5-15), Rcpp (≥ 0.12.14), RcppParallel (≥ 5.1.1), sf, stats, stringr, terra (≥ 1.5-12), tools, utils |
| LinkingTo: |
BH, Rcpp, RcppParallel |
| Suggests: |
gdistance, igraph, knitr, readxl, rmarkdown, sp, spatstat (≥
3.3-3), spatstat.geom, spatstat.random, spcosa, spsurvey (≥
5.3.0), testthat |
| Published: |
2026-02-24 |
| DOI: |
10.32614/CRAN.package.secr |
| Author: |
Murray Efford 
[aut, cre],
Philipp Jund [ctb] (faster transect search and spacing),
David Fletcher [ctb] (overdispersion),
Yan Ru Choo [ctb]
(goodness-of-fit) |
| Maintainer: |
Murray Efford <murray.efford at otago.ac.nz> |
| License: |
GPL-2 | GPL-3 [expanded from: GPL (≥ 2)] |
| URL: |
https://www.otago.ac.nz/density/,
https://github.com/MurrayEfford/secr/ |
| NeedsCompilation: |
yes |
| SystemRequirements: |
GNU make |
| Citation: |
secr citation info |
| Materials: |
NEWS |
| In views: |
Environmetrics |
| CRAN checks: |
secr results |