Description Usage Arguments Details Value References Examples
Estimates parameters for a Neyman-Scott point process by maximising the Palm likelihood. This approach was first proposed by Tanaka et al. (2008) for two-dimensional Thomas processes. Further generalisations were made by Stevenson, Borchers, and Fewster (in prep) and Jones-Todd (2017).
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points |
A matrix containing locations of observed points, where each row corresponds to a point and each column corresponds to a dimension. |
lims |
A matrix with two columns, corresponding to the upper and lower limits of each dimension, respectively. |
R |
Truncation distance for the difference process. |
disp |
A character string indicating the distribution of
children around their parents. Use |
child.dist |
The distribution of the number of children
generated by a randomly selected parent. For a Poisson
distribution, use |
child.info |
A list of further information that is required about the distribution for the number of children generated by parents. See ‘Details’. |
sibling.list |
An optional list that comprises (i) a component
named |
edge.correction |
The method used for the correction of edge
effects. Either |
start |
A named vector of starting values for the model parameters. |
bounds |
A list with named components. Each component should be a vector of length two, giving the upper and lower bounds for the named parameter. |
trace |
Logical; if |
The parameter D
is the density of parent points, which is
always estimated. Possible additional parameters are
lambda
, the expected number of children generated per
parent (when child.dist = "pois"
).
p
, the proportion of the x
possible children
are generated (when child.dist = "binomx"
).
kappa
, the average length of the surface phase of a
diving cetacean (when child.dist = "twoplane"
; see
Stevenson, Borchers, and Fewster, in prep).
sigma
, the standard deviation of dispersion along
each dimension (when disp
= "gaussian").
tau
, the maximum distance a child can be from its
parent (when disp
= "uniform")
The "child.info"
argument is required when child.dist
is set to "twoplane"
. It must be a list that comprises (i) a
component named w
, providing the halfwidth of the detection
zone; (ii) a component named b
, providing the halfwidth of
the survey area; (iii) a component named l
, providing the
time lag between planes (in seconds); and (iv) a component named
tau
, providing the mean dive-cycle duration. See Stevenson,
Borchers, and Fewster (in prep) for details.
An R6 reference class object. Extraction of the information held within is best handled by functions coef.nspp, confint.nspp, summary.nspp, and plot.nspp.
Tanaka, U., Ogata, Y., and Stoyan, D. (2008) Parameter estimation and model selection for Neyman-Scott point processes. Biometrical Journal, 50: 43–57.
Stevenson, B. C., Borchers, D. L., and Fewster, R. M. (in prep) Trace-contrast methods to account for identification uncertainty on aerial surveys of cetacean populations.
Jones-Todd, C. M. (2017) Modelling complex dependencies inherent in spatial and spatio-temporal point pattern data. PhD thesis, University of St Andrews.
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