This package for R analyzes single or double observer distance sampling data for line or point sampling. It is used in program DISTANCE as one of the analysis engines. Supported double observer configurations include independent, trial and removal. All options in mrds are not yet fully supported via DISTANCE.
The easiest way to ensure you have the latest version of
mrds, is to install Hadley Wickham’s
mrds from github:
mrdsis available on CRAN, though this may be up to a month out of date due to CRAN policy.
The following are references for the methods used in the package.
Burt, M. L., D. L. Borchers, K. J. Jenking and T. A. Marques. (2014). “Using mark-recapture distance sampling methods on line transect surveys.” Methods in Ecology and Evolution 5: 1180-1191.
Buckland, S. T., J. Laake, et al. (2010). “Double observer line transect methods: levels of independence.” Biometrics 66: 169-177.
Borchers, D. L., J. L. Laake, et al. (2006). “Accommodating unmodeled heterogeneity in double-observer distance sampling surveys.” Biometrics 62(2): 372-378.
Buckland, S. T., D. R. Anderson, et al., Eds. (2004). Advanced distance sampling: estimating abundance of biological populations. Oxford, UK; New York, Oxford University Press. (see chapter 6).