cauchy.estpcf(spatstat)
cauchy.estpcf()所属R语言包:spatstat
Fit the Neyman-Scott cluster process with Cauchy kernel
适合的奈曼 - 斯科特聚类的过程与Cauchy核
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Fits the Neyman-Scott Cluster point process with Cauchy kernel to a point pattern dataset by the Method of Minimum Contrast, using the pair correlation function.
符合奈曼 - 斯科特聚点Cauchy核阵列点数据集的最小对比度的方法,对相关功能的使用。
用法----------Usage----------
cauchy.estpcf(X, startpar=c(kappa=1,eta2=1), lambda=NULL,
q = 1/4, p = 2, rmin = NULL, rmax = NULL, ...,
pcfargs = list())
参数----------Arguments----------
参数:X
Data to which the model will be fitted. Either a point pattern or a summary statistic. See Details.
数据,模型将被安装。无论是点模式或一个简要统计。查看详细信息。
参数:startpar
Vector of starting values for the parameters of the model.
向量的起始的模型的参数的值。
参数:lambda
Optional. An estimate of the intensity of the point process.
可选。的点处理的强度的估计值。
参数:q,p
Optional. Exponents for the contrast criterion.
可选。指数的对比标准。
参数:rmin, rmax
Optional. The interval of r values for the contrast criterion.
可选。的间隔r的值的对比标准。
参数:...
Optional arguments passed to optim to control the optimisation algorithm. See Details.
可选参数传递给optim控制的优化算法。查看详细信息。
参数:pcfargs
Optional list containing arguments passed to pcf.ppp to control the smoothing in the estimation of the pair correlation function.
可选列表,其中包含的参数传递给pcf.ppp控制平滑在对相关函数的估计。
Details
详细信息----------Details----------
This algorithm fits the Neyman-Scott cluster point process model with Cauchy kernel to a point pattern dataset by the Method of Minimum Contrast, using the pair correlation function.
该算法适合的奈曼 - 斯科特聚点过程模型与柯西内核阵列点数据集的最小对比度的方法,对相关功能的使用。
The argument X can be either
参数X可以是
a point pattern: An object of class "ppp" representing a point pattern dataset. The pair correlation function of the point pattern will be computed using pcf, and the method of minimum contrast will be applied to this.
点模式:一个对象类"ppp"的一个点模式的数据集。对相关函数的点格局将被计算使用pcf,和最小对比度的方法将被应用到这个。
a summary statistic: An object of class "fv" containing the values of a summary statistic, computed for a point pattern dataset. The summary statistic should be the pair correlation function, and this object should have been obtained by a call to pcf or one of its relatives.
一个简要统计:类的一个对象"fv"值的汇总统计,计算点模式数据集。摘要统计应该是对相关功能,这个对象应该已经获得通过调用pcf或它的一个亲戚。
The algorithm fits the Neyman-Scott cluster point process with Cauchy kernel to X, by finding the parameters of the Matern Cluster model which give the closest match between the theoretical pair correlation function of the Matern Cluster process and the observed pair correlation function. For a more detailed explanation of the Method of Minimum Contrast, see mincontrast.
该算法适合的奈曼 - 斯科特聚类的点过程与Cauchy核X,通过查找最接近的匹配的理论对相关功能的Matern聚类过程中所观察到的对关联之间的Matern聚类模式的参数功能。最低对比度的方法对于更详细的说明,请参阅mincontrast。
The model is described in Jalilian et al (2011). It is a cluster process formed by taking a pattern of parent points, generated according to a Poisson process with intensity kappa, and around each parent point, generating a random number of offspring points, such that the number of offspring of each parent is a Poisson random variable with mean mu, and the locations of the offspring points of one parent follow a common distribution described in Jalilian et al (2011).
Jalilian等人(2011年)中描述的模型。这是一个聚类过程中形成通过服用的图案的父点,根据泊松过程强度kappa产生,和围绕每个父点,产生一个随机数的后代点,使得每个后代的数目父母是Poisson随机变量,平均mu,和一个父遵循一个共同的分布Jalilian等人(2011)在描述的后代的位置。
If the argument lambda is provided, then this is used as the value of the point process intensity lambda. Otherwise, if X is a point pattern, then lambda will be estimated from X. If X is a summary statistic and lambda is missing, then the intensity lambda cannot be estimated, and the parameter mu will be returned as NA.
如果参数lambda,这是作为值点过程强度lambda。否则,如果X是一个点的模式,那么lambda将估计X。如果X是一个简要统计和lambda失踪,然后强度lambda无法估计的参数mu将返回NA。
The remaining arguments rmin,rmax,q,p control the method of minimum contrast; see mincontrast.
其余的参数rmin,rmax,q,p的最小对比度控制的方法,请参阅mincontrast。
The corresponding model can be simulated using rCauchy.
相应的模型可以模拟使用rCauchy。
For computational reasons, the optimisation procedure uses the parameter eta2, which is equivalent to 4 * omega^2 where omega is the scale parameter for the model as used in rCauchy.
对于计算的原因,优化程序使用参数eta2,这相当于4 * omega^2其中omega是在rCauchy所用模型的尺度参数。
Homogeneous or inhomogeneous Neyman-Scott/Cauchy models can also be fitted using the function kppm and the fitted models can be simulated using simulate.kppm.
均匀或不均匀Neyman-Scott/Cauchy模型也可以安装使用的功能kppm和拟合模型,可以模拟使用simulate.kppm。
The optimisation algorithm can be controlled through the additional arguments "..." which are passed to the optimisation function optim. For example, to constrain the parameter values to a certain range, use the argument method="L-BFGS-B" to select an optimisation algorithm that respects box constraints, and use the arguments lower and upper to specify (vectors of) minimum and maximum values for each parameter.
优化算法可以通过额外的参数来控制"...",是传递给优化函数optim。例如,要限制的参数值在一定范围内,使用参数method="L-BFGS-B"选择尊重框式约束的优化算法,并使用的参数lower和upper,“指定(向量)为每个参数的最小值和最大值。
值----------Value----------
An object of class "minconfit". There are methods for printing and plotting this object. It contains the following main components:
对象的类"minconfit"。有这个对象的打印和绘图的方法。它包含以下主要组件:
参数:par
Vector of fitted parameter values.
拟合参数值的向量。
参数:fit
Function value table (object of class "fv") containing the observed values of the summary statistic (observed) and the theoretical values of the summary statistic computed from the fitted model parameters.
函数值表(对象类"fv")的观测值的汇总统计(observed)与理论值拟合模型参数的汇总统计计算。
(作者)----------Author(s)----------
Abdollah Jalilian and Rasmus Waagepetersen.
Adapted for <span class="pkg">spatstat</span> by Adrian Baddeley
<a href="mailto:Adrian.Baddeley@csiro.au">Adrian.Baddeley@csiro.au</a>
<a href="http://www.maths.uwa.edu.au/~adrian/">http://www.maths.uwa.edu.au/~adrian/</a>
参考文献----------References----------
An estimating function approach to inference for inhomogeneous Neyman-Scott processes. Biometrics 63, 252–258.
Decomposition of variance for spatial Cox processes. Manuscript submitted for publication.
参见----------See Also----------
kppm, cauchy.estK, lgcp.estpcf, thomas.estpcf, vargamma.estpcf, mincontrast, pcf, pcfmodel.
kppm,cauchy.estK,lgcp.estpcf,thomas.estpcf,vargamma.estpcf,mincontrast,pcf,pcfmodel。
rCauchy to simulate the model.
rCauchy模拟模型。
实例----------Examples----------
u <- cauchy.estpcf(redwood)
u
plot(u, legendpos="topright")
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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