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. Please direct 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_2.1.0.zip 1868K       << current Windows binary
openCR_2.1.0.tgz 1942K       << current OS X binary
openCR_2.1.0.tar.gz 522K     << current source package  

Distributed with package                  

openCR-vignette.pdf 243K      << introduction and overview
openCR-manual.pdf 291K       << help pages openCR 2.1.0

Additional vignettes

openCR-examples.pdf 259K   << examples 

Archived versions

Last updated: 19 August 2021

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