PRESENCE - Estimates patch occupancy rates and related parameters. This work is in collaboration with Darryl MacKenzie, and is largely funded by the Amphibian Research and Monitoring Initiative (ARMI). Contact Darryl if you would like to learn more about this project.

Current Version: 13.6


book cover image MacKenzie, D. I., J. D. Nichols, J. A. Royle, K. H. Pollock, L.L. Bailey, and J. E. Hines. 2018. Occupancy Estimation and Modeling - Inferring Patterns and Dynamics of Species Occurrence. 2nd Edition. Elsevier Publishing.
ecology image MacKenzie, D. I., J. D. Nichols, G. B. Lachman, S. Droege, J. A. Royle and C. A. Langtimm. 2002. Estimating site occupancy rates when detection probabilities are less than one. Ecology 83(8): 2248-2255 ecology image MacKenzie, D. I., J. D. Nichols, J. E. Hines, M. G. Knutson and A. B. Franklin. 2003. Estimating site occupancy, colonization and local extinction probabilities when a species is detected imperfectly. Ecology 84(8) 2200-2207.
ecological Applications image Bailey, L. L., J.D. Nichols and J.E. Hines. 2007. Exploring Sampling Design Trade-Offs In Occupancy Studies With imperfect detection: examples and software. Ecological Applications, 17(1). pp. 281-290. methods in ecology and evolution image Guillera-Arroita, G. and J.J. Lahoz-Monfort. 2012. Designing studies to detect differences in species occupancy: power analysis under imperfect detection. Methods in Ecology and Evolution 2012, 3, 860-869.



Current Version: 13.6
PRESENCE (includes GenPres)
PRESENCE (includes GenPres, no install/setup program)
RPresence binary package for Windows
RPresence source package for OSX/Linux

Recent Modifications

Ver 13.5 (05Jun2020) - fix error in seasonal covariates for p1,p2 in RPresence
Ver 13.4 (05Jun2020) - fix error in seasonal covariates for Cpsi,CR in RPresence
Ver 13.1 (14May2020) - recompile RPrsence for R 4.0.0
Ver 12.43 (21Apr2020) - fix Nichols/Royal models in Presence GUI
Ver 12.42 (14Apr2020) - fix do.4 model in RPresence
Ver 12.41 (07Apr2020) - minor misc updates
Ver 12.40 (31Mar2020) - modified limit on warnings about missing det/cov data
Ver 12.39 (05Mar2020) - modified model in RPresence, fix bug in cpsi output for mult-season model.
Ver 12.38 (07Feb2020) - add seasonal cpsi to multi-season model.
Ver 12.37 (03Jan2020) - fix MS/DO RPres model.

PRESENCE workshops

Information about upcoming workshops on the use of Occupancy modeling using PRESENCE can be found at: