madogram(SpatialExtremes)
madogram()所属R语言包:SpatialExtremes
Computes madograms
计算madograms
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Computes the madogram for max-stable processes.
计算madogram最大稳定的过程。
用法----------Usage----------
madogram(data, coord, fitted, n.bins, gev.param = c(0, 1, 0), which =
c("mado", "ext"), xlab, ylab, col = c(1, 2), angles = NULL, marge =
"emp", add = FALSE, xlim = c(0, max(dist)), ...)
参数----------Arguments----------
参数:data
A matrix representing the data. Each column corresponds to one location.
矩阵表示数据。每一列对应于一个位置。
参数:coord
A matrix that gives the coordinates of each location. Each row corresponds to one location.
的矩阵,使每一个位置的坐标。每一行对应于一个位置。
参数:fitted
An object of class maxstab - usually the output of the fitmaxstab function. May be missing.
对象的的类maxstab - 通常的输出fitmaxstab功能。可能会丢失。
参数:n.bins
The number of bins to be used. If missing, pairwise madogram estimates will be computed.
箱的数目被使用。如果缺少,两两madogram估计会被计算。
参数:gev.param
Numeric vector of length 3 specifying the location, scale and shape parameters for the GEV.
长度为3的数字矢量指定的地点,规模和形状参数的GEV。
参数:which
A character vector of maximum size 2. It specifies if the madogram and/or the extremal coefficient functions have to be plotted.
字符向量的最大大小为2。它指定如果的madogram和/或极值的系数函数要绘制。
参数:xlab,ylab
The x-axis and y-axis labels. May be missing. Note that ylab must have the same length has which.
x轴和y轴的标签。可能会丢失。请注意,ylab必须具有相同的长度有which。
参数:col
The colors used for the points and optionnaly for the fitted curve.
所使用的颜色的点和任选是拟合曲线。
参数:angles
A numeric vector. A partition of the interval (0, π) to help detecting anisotropy.
一个数值向量。分区的间隔(0, π)帮助检测各向异性。
参数:marge
Character string. If 'emp', the observation are first transformed to the unit Frechet scale by using the empirical CDF. If 'mle' (default), maximum likelihood estimates are used.
字符的字符串。如果emp中,第一个变换观察到该单位的Frechet规模使用的经验CDF。如果MLE(默认),最大似然估计的使用。
参数:add
Logical. If TRUE, the plot is added to the current figure; otherwhise (default) a new plot is computed.
逻辑。如果TRUE,该图目前的数字otherwhise(默认)一个新的绘图计算。
参数:xlim
A numeric vector of length 2 specifying the x coordinate range.
一个数值向量长度为2的指定的x坐标范围。
参数:...
Additional options to be passed to the plot function.
到传递给plot功能的附加选项。
Details
详细信息----------Details----------
Let Z(x) be a stationary process. The madogram is defined as follows:
让我们Z(x)是一个平稳过程。 madogram被定义如下:
If now Z(x) is a stationary max-stable random field with GEV marginals. Provided the GEV shape parameter ξ is such that ξ <1. The extremal coefficient θ(h) satisfies:
如果现在Z(x)是一个固定的最大稳定的随机场与GEV边缘人。提供了GEV形状参数ξ是这样ξ <1。 θ(h)满足的极值系数:
where Γ is the gamma function and u_β is defined as follows:
Γ是伽玛函数和u_β的定义如下:
and β= (μ, σ, ξ), i.e, the vector of the GEV parameters.
和β= (μ, σ, ξ),即,的GEV参数向量。
值----------Value----------
A graphic and (invisibly) a matrix with the lag distances, the madogram and extremal coefficient estimates.
的图形(不可见)的滞后的距离,madogram和极值估计系数矩阵。
(作者)----------Author(s)----------
Mathieu Ribatet
参考文献----------References----------
spatial max-stable random fields. Dependence in Probability and Statistics, 373–390.
参见----------See Also----------
fmadogram, lmadogram
fmadogram,lmadogram
实例----------Examples----------
n.site <- 15
locations <- matrix(runif(2*n.site, 0, 10), ncol = 2)
colnames(locations) <- c("lon", "lat")
##Simulate a max-stable process - with unit Frechet margins[#模拟一个最大稳定的过程 - 与单位的Frechet空间]
data <- rmaxstab(40, locations, cov.mod = "whitmat", nugget = 0, range = 1,
smooth = 2)
##Compute the madogram[#计算的madogram,]
madogram(data, locations)
##Compare the madogram with a fitted max-stable model[#一个装有最大稳定的模型比较madogram]
fitted <- fitmaxstab(data, locations, "whitmat", nugget = 0)
madogram(fitted = fitted, which = "ext")
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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