clarkevans.test(spatstat)
clarkevans.test()所属R语言包:spatstat
Clark and Evans Test
克拉克和埃文斯测试
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Performs the Clark-Evans test of aggregation for a spatial point pattern.
执行克拉克 - 埃文斯试验聚集的空间点格局。
用法----------Usage----------
clarkevans.test(X, ...,
correction="none",
clipregion=NULL,
alternative=c("two.sided", "less", "greater"),
nsim=1000)
参数----------Arguments----------
参数:X
A spatial point pattern (object of class "ppp").
一个空间点模式(类的对象"ppp")。
参数:...
Ignored.
忽略。
参数:correction
Character string. The type of edge correction to be applied. See clarkevans
字符的字符串。要应用的类型的边缘校正。见clarkevans
参数:clipregion
Clipping region for the guard area correction. A window (object of class "owin"). See clarkevans
保护区调整的裁剪区域。一个窗口(类的对象"owin"“)。见clarkevans
参数:alternative
String indicating the type of alternative for the hypothesis test.
字符串类型的替代的假设检验。
参数:nsim
Number of Monte Carlo simulations to perform, if a Monte Carlo p-value is required.
蒙特卡罗模拟执行,,如果蒙地卡罗p值是必需的。
Details
详细信息----------Details----------
This command uses the Clark and Evans (1954) aggregation index R as the basis for a crude test of clustering or ordering of a point pattern.
此命令使用的克拉克和Evans(1954)聚集指数R一个粗略的测试的聚类或订购的点模式的基础。
The Clark-Evans index is computed by the function clarkevans. See the help for clarkevans for information about the Clark-Evans index R and about the arguments correction and clipregion.
克拉克 - 埃文斯指数的计算方法是功能clarkevans。 clarkevans的克拉克 - 埃文斯指数R的信息和有关的参数correction和clipregion的请参阅帮助。
This command performs a hypothesis test of clustering or ordering of the point pattern X. The null hypothesis is Complete Spatial Randomness, i.e.\ a uniform Poisson process. The alternative hypothesis is specified by the argument alternative:
该命令执行的假设检验,聚类或订购点模式X的。零假设是完全空间随机性,即\一个统一的泊松过程。另一种假设是参数所指定alternative:
alternative="less" or alternative="clustered": the alternative hypothesis is that R < 1 corresponding to a clustered point pattern;
alternative="less"或alternative="clustered":另一种假设是,R < 1对应的一个聚集点模式;
alternative="greater" or alternative="regular": the alternative hypothesis is that R > 1 corresponding to a regular or ordered point pattern;
alternative="greater"或alternative="regular":另一种假设是,R > 1相应的定期或有序的点模式;
alternative="two.sided": the alternative hypothesis is that R != 1 corresponding to a clustered or regular pattern.
alternative="two.sided":另一种假设是,R != 1对应于一个聚类或规律。
The Clark-Evans index R is computed for the data as described in clarkevans.
的Clark-埃文斯指数R被计算的数据,如在clarkevans。
If correction="none", the p-value for the test is computed by standardising R as proposed by Clark and Evans (1954) and referring the statistic to the standard Normal distribution.
correction="none"如果,p值的测试计算,通过标准化R的建议由克拉克和Evans(1954)和参考的标准正态分布的统计。
For other edge corrections, the p-value for the test is computed by Monte Carlo simulation of nsim realisations of Complete Spatial Randomness.
p价值的测试对于其他边缘改正,nsim实现完整的空间随机性的Monte Carlo模拟计算。
值----------Value----------
An object of class "htest" representing the result of the test.
类的一个对象"htest"代表的测试的结果。
(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>
参考文献----------References----------
Distance to nearest neighbour as a measure of spatial relationships in populations Ecology 35, 445–453.
and edge-effect of total nearest neighbour distance. In Simulation methods in archaeology, Cambridge University Press, pp 91–95.
参见----------See Also----------
clarkevans
clarkevans
实例----------Examples----------
# Example of a clustered pattern[在聚类模式的示例]
data(redwood)
clarkevans.test(redwood)
clarkevans.test(redwood, alternative="less")
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。
|