miplot(spatstat)
miplot()所属R语言包:spatstat
Morishita Index Plot
森下指数图
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Displays the Morishita Index Plot of a spatial point pattern.
显示森指数图的空间点格局。
用法----------Usage----------
miplot(X, ...)
参数----------Arguments----------
参数:X
A point pattern (object of class "ppp") or something acceptable to as.ppp.
点模式(对象类"ppp")或一些可以接受的as.ppp。
参数:...
Optional arguments to control the appearance of the plot.
可选参数来控制外观的图。
Details
详细信息----------Details----------
Morishita (1959) defined an index of spatial aggregation for a spatial point pattern based on quadrat counts. The spatial domain of the point pattern is first divided into Q subsets (quadrats) of equal size and shape. The numbers of points falling in each quadrat are counted. Then the Morishita Index is computed as
森(1959)定义的空间聚集索引的空间点格局的基础上样方数。 Q相同的大小和形状的子集(样方)首先被划分成的空间域的点图案。点在每个样方的数量进行计数。然后,森下指数被计算为
where n[i] is the number of points falling in the i-th quadrat, and N is the total number of points. If the pattern is completely random, MI should be approximately equal to 1. Values of MI greater than 1 suggest clustering.
n[i]是个i样点的数量,和N的总点数。如果该模式是完全随机的,MI应该是大约等于1。 MI大于1的值建议聚类。
The Morishita Index plot is a plot of the Morishita Index MI against the linear dimension of the quadrats. The point pattern dataset is divided into 2 * 2 quadrats, then 3 * 3 quadrats, etc, and the Morishita Index is computed each time. This plot is an attempt to discern different scales of dependence in the point pattern data.
森指数图森指数MI对线性尺寸的样方的图。分为2 * 2样方,然后3 * 3样方等,森指数计算每次点模式数据。此图是一个尝试识别不同尺度的依赖点的图形数据。
值----------Value----------
None.
无。
(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----------
analysis of the distributional patterns. Memoir of the Faculty of Science, Series E2, Kyushu University. Pages 215–235.
参见----------See Also----------
quadratcount
quadratcount
实例----------Examples----------
data(longleaf)
miplot(longleaf)
opa <- par(mfrow=c(2,3))
data(cells)
data(japanesepines)
data(redwood)
plot(cells)
plot(japanesepines)
plot(redwood)
miplot(cells)
miplot(japanesepines)
miplot(redwood)
par(opa)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
注1:为了方便大家学习,本文档为生物统计家园网机器人LoveR翻译而成,仅供个人R语言学习参考使用,生物统计家园保留版权。
注2:由于是机器人自动翻译,难免有不准确之处,使用时仔细对照中、英文内容进行反复理解,可以帮助R语言的学习。
注3:如遇到不准确之处,请在本贴的后面进行回帖,我们会逐渐进行修订。
|