aDist(robCompositions)
aDist()所属R语言包：robCompositions
Aitchison distance
艾奇逊距离
译者：生物统计家园网 机器人LoveR
描述----------Description----------
Computes the Aitchison distance between two observations or between two data sets.
计算的艾吉森的两次观测之间或两个数据集之间的距离。
用法----------Usage----------
aDist(x, y)
参数----------Arguments----------
参数：x
a vector, matrix or data.frame
一个向量，矩阵或数据框
参数：y
a vector, matrix or data.frame with equal dimension as x
等维的向量，矩阵或数据框，与x
Details
详细信息----------Details----------
This distance measure accounts for the relative scale property of the Aitchison distance. It measures the distance between two compositions if x and y are vectors and evaluate sum of the distances between x and y for each row of x and y if x and y are matrices or data frames.
这个距离测量的相对规模占财产的艾奇逊距离。它可以测量两种成分之间的距离，如果x和y是向量和评估x和y的每一行x和之间的距离的总和y如果x和y是矩阵或数据框。
It is not designed to apply it on one matrix, such as function "acomp()" in package "compositions", but it is designed to compare different matrices.
它的目的不是将其应用于一个矩阵，如函数的ACOMP（）包成分，但它的目的是比较不同的矩阵。
The underlying code is written in C and allows a fast computation also for large data sets.
底层代码是用C写的，也可以快速计算的大型数据集。
值----------Value----------
The Aitchison distance between two compositions or between two data sets.
艾奇逊两种组合物之间或两个数据集之间的距离。
（作者）----------Author(s)----------
Matthias Templ
参考文献----------References----------
Data Monographs on Statistics and Applied Probability. Chapman and Hall Ltd., London (UK). 416p.
compositional distance. Mathematical Geology, 32, 271-275.
Computational Statistics and Data Analysis, vol 54 (12), pages 3095-3107.
参见----------See Also----------
ilr
ilr
实例----------Examples----------
data(expenditures)
x <- xOrig <- expenditures
## Aitchison distance between the first 2 observations:[＃艾奇逊的第2个观察值之间的距离：]
aDist(x[,1], x[,2])
## set some missing values:[＃设置一些失踪的值：]
x[1,3] <- x[3,5] <- x[2,4] <- x[5,3] <- x[8,3] <- NA
## impute them:[＃归咎于他们：]
xImp <- impCoda(x, method="ltsReg")$xImp
## calculate the relative Aitchsion distance between xOrig and xImp:[＃计算的的相对Aitchsion之间的距离xOrig和xImp的：]
aDist(xOrig, xImp)
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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。
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发表于 2012-9-27 19:58:41
