K3est(spatstat)
K3est()所属R语言包:spatstat
K-function of a Three-Dimensional Point Pattern
K-函数的一个三维点模式
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Estimates the K-function from a three-dimensional point pattern.
估计K功能从一个三维点模式。
用法----------Usage----------
K3est(X, ..., rmax = NULL, nrval = 128, correction = c("translation", "isotropic"))
参数----------Arguments----------
参数:X
Three-dimensional point pattern (object of class "pp3").
三维点的模式(对象类"pp3")。
参数:...
Ignored.
忽略。
参数:rmax
Optional. Maximum value of argument r for which K3(r) will be estimated.
可选。最大的参数值rK3(r)将估计。
参数:nrval
Optional. Number of values of r for which K3(r) will be estimated. A large value of nrval is required to avoid discretisation effects.
可选。 r的K3(r)将估计值数。一个较大的值nrval要求,以避免离散的影响。
参数:correction
Optional. Character vector specifying the edge correction(s) to be applied. See Details.
可选。字符向量指定的边缘校正(S)。查看详细信息。
Details
详细信息----------Details----------
For a stationary point process Phi in three-dimensional space, the three-dimensional K function is
对于一个固定的点过程Phi在三维空间中,三维K函数是
where lambda is the intensity of the process (the expected number of points per unit volume) and N(Phi,x,r) is the number of points of Phi, other than x itself, which fall within a distance r of x. This is the three-dimensional generalisation of Ripley's K function for two-dimensional point processes (Ripley, 1977).
其中lambda的过程中的强度(每单位体积的预期数量的点)和N(Phi,x,r)是Phi比x本身,以及其他的数目的点,这属于在距离rx。里普利K功能对二维的点过程(里普利,1977),这是三维的概括。
The three-dimensional point pattern X is assumed to be a partial realisation of a stationary point process Phi. The distance between each pair of distinct points is computed. The empirical cumulative distribution function of these values, with appropriate edge corrections, is renormalised to give the estimate of K3(r).
的三维点模式X被认为是一个固定的点过程Phi部分实现。每对不同的点之间的距离被计算出来。这些值,经验累积分布函数与适当的边缘修正,renormalised给的估计K3(r)的。
The available edge corrections are:
边缘修正:
the Ohser translation correction estimator (Ohser, 1983; Baddeley et al, 1993)
Ohser翻译校正估计器(Ohser,1983;巴德利等人,1993)
the three-dimensional counterpart of Ripley's isotropic edge correction (Ripley, 1977; Baddeley et al, 1993).
三维对应雷普利各向同性的边缘校正(雷普利,1977;巴德利等人,1993)。
值----------Value----------
A function value table (object of class "fv") that can be plotted, printed or coerced to a data frame containing the function values.
,可以绘制,打印或强制转换为一个数据框包含的函数值的函数值表(对象类"fv")。
(作者)----------Author(s)----------
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>
and Rana Moyeed.
参考文献----------References----------
Analysis of a three-dimensional point pattern with replication. Applied Statistics 42, 641–668.
On estimators for the reduced second moment measure of point processes. Mathematische Operationsforschung und Statistik, series Statistics, 14, 63 – 71.
Modelling spatial patterns (with discussion). Journal of the Royal Statistical Society, Series B, 39, 172 – 212.
参见----------See Also----------
F3est, G3est, pcf3est
F3est,G3est,pcf3est
实例----------Examples----------
X <- rpoispp3(42)
Z <- K3est(X)
if(interactive()) plot(Z)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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