Functions to fit point process models using the Palm likelihood. First proposed by Tanaka, Ogata, and Stoyan (2008)
This package provides functions for the fitting of point process models using the Palm likelihood. Maximisation of the Palm likelihood can provide computationally efficient parameter estimation in situations where the full likelihood is intractable. This package is chiefly focussed on Neyman-Scott point processes, but can also fit void processes. Estimation via the Palm likelihood was first proposed by Tanaka, Ogata, and Stoyan (2008) and further generalised by both Stevenson, Borchers, and Fewster (in review) and Jones-Todd et al. (in submission).
The development of this package was motivated by the analysis of capture-recapture surveys on which individuals cannot be identified---the data from which can conceptually be seen as a clustered point process. Some of the functions in this package are specifically for the estimation of cetacean density from two-camera aerial surveys.
The stable version of this package can be installed from CRAN:
Jones-Todd, C. M., Caie, P., Illian, J., Stevenson, B. C., Savage, A., Harrison, D. J., and Bown, J. L. (in submission). Identifying unusual structures in tissue sections of colon cancer patients using point pattern analysis.
Stevenson, B. C., Borchers, D. L., and Fewster, R. M. (in revision) Cluster capture-recapture to account for identification uncertainty on aerial surveys of animal populations.
Tanaka, U., Ogata, Y., and Stoyan, D. (2008) Parameter estimation and model selection for Neyman-Scott point processes. Biometrical Journal, 50: 43--57.
Added the `use.bobyqa' argument to fit.ns(), allowing optimisation via the bobyqa() function from the minqa package.
Bug fix for bootstrap simulations with no generated children.
Added sim.twocamera() to simulate data from two-camera aerial surveys.
Added the `parents' argument to simulation functions, so that the user can specify their own parent locations.
Added a component containing parent locations to the output of sim.ns().
Bug fix for buffer edge correction with fit.twocamera().
Bug fix for user-specified parameter bounds with fit.void().
First release of palm, after the original project was named 'nspp'.
Includes functions to fit Neyman-Scott point processes (including Thomas process and Matern process variants) and void processes.
Includes a function to estimate cetacean density from two-camera aerial surveys.
Includes functions to simulate from all of the above models.