R package openCR

The R package openCR implements open-population capture–recapture models for data in the secr capthist format.

openCR is available from CRAN - including Windows and Mac binaries. The code is also on GitHub and bug reports may be posted there. Please direct other questions to the DENSITY|secr forum at phidot.org or the Google group secr.    


  • spatial and nonspatial models
  • seamless integration with secr 
  • choice of parameterization, covering most earlier CJS and JS models
  • robust design
  • formulas for model specification 
  • open-source
  • stratified models (2.0.2)
  • movement models


  • openCR 1.4.1 and 1.5.0 corrected significant bugs in the movement model of earlier versions
  • users should be R-literate and familiar with capture–recapture
  • see openCR-vignette.pdf for a list of limitations and speed tips.

openCR_2.2.5.zip 2552K       << current Windows binary
openCR_2.2.5.tgz 3145K       << current OS X binary
openCR_2.2.5.tar.gz 2169K     << current source package  

Distributed with package                  

openCR-vignette.pdf 247K      << introduction and overview
openCR-manual.pdf 323K       << help pages openCR 2.2.5

Additional vignettes

openCR-examples.pdf 245K   << examples 

openCR-kernel.pdf 258K        << movement kernels

Archived versions

Last updated: 28 September 2022

University of Otago DENSITY: software for spatially explicit capture–recapture