Lest(spatstat)
Lest()所属R语言包:spatstat
L-function
L-函数
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Calculates an estimate of the L-function (Besag's transformation of Ripley's K-function) for a spatial point pattern.
计算的估计L功能(Besag的改造里普利K功能)的空间点格局。
用法----------Usage----------
Lest(X, ...)
参数----------Arguments----------
参数:X
The observed point pattern, from which an estimate of L(r) will be computed. An object of class "ppp", or data in any format acceptable to as.ppp().
观测点的模式,从一个估算的L(r)将被计算。对象的类"ppp",或任何格式的数据中接受的as.ppp()。
参数:...
Other arguments passed to Kest to control the estimation procedure.
其他参数传递给Kest控制的估计过程。
Details
详细信息----------Details----------
This command computes an estimate of the L-function for the spatial point pattern X. The L-function is a transformation of Ripley's K-function,
该命令计算的估计空间点格局L的X功能。 L功能是一个改造里普利K功能,
where K(r) is the K-function.
K(r)是K功能。
See Kest for information about Ripley's K-function. The transformation to L was proposed by Besag (1977).
见Kest的信息约里普利K功能。 L的转型提出了由Besag(1977)。
The command Lest first calls Kest to compute the estimate of the K-function, and then applies the square root transformation.
命令Lest第一次调用Kest来计算的估计K功能,然后再应用的平方根转换。
For a completely random (uniform Poisson) point pattern, the theoretical value of the L-function is L(r) = r. The square root also has the effect of stabilising the variance of the estimator, so that K is more appropriate for use in simulation envelopes and hypothesis tests.
对于一个完全随机的均匀泊松点模式,理论值是L的L(r) = r功能。稳定估计的方差的平方根也有效果,从而使K是更适合于使用在模拟信封和假设检验。
See Kest for the list of arguments.
见Kest参数列表。
值----------Value----------
An object of class "fv", see fv.object, which can be plotted directly using plot.fv.
类的一个对象"fv",fv.object,它可以绘制直接使用plot.fv的。
Essentially a data frame containing columns
本质上是一个数据框包含多个列
参数:r
the vector of values of the argument r at which the function L has been estimated
的参数的值的矢量r在哪些函数L已估计
参数:theo
the theoretical value L(r) = r for a stationary Poisson process
理论值L(r) = r平稳泊松过程
together with columns named "border", "bord.modif", "iso" and/or "trans", according to the selected edge corrections. These columns contain estimates of the function L(r) obtained by the edge corrections named.
一起列名为"border","bord.modif","iso"和/或"trans",根据选定的边修正。这些列包含的功能L(r)命名的边缘修正的估计。
方差近似----------Variance approximations----------
If the argument var.approx=TRUE is given, the return value includes columns rip and ls containing approximations to the variance of Lest(r) under CSR. These are obtained by the delta method from the variance approximations described in Kest.
如果参数var.approx=TRUE,返回值的列rip和ls包含近似的方差Lest(r)根据“公务员事务规例”。这些描述在Kest从方差近似delta方法通过以下方式获得。
(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 Rolf Turner
<a href="mailto:r.turner@auckland.ac.nz">r.turner@auckland.ac.nz</a>
参考文献----------References----------
Discussion of Dr Ripley's paper. Journal of the Royal Statistical Society, Series B, 39, 193–195.
参见----------See Also----------
Kest, pcf
Kest,pcf
实例----------Examples----------
data(cells)
L <- Lest(cells)
plot(L, main="L function for cells")
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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