eof(wq)
eof()所属R语言包:wq
Empirical orthogonal functions
经验正交函数
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Finds and rotates empirical orthogonal functions (<acronym>EOF</acronym>s, or principal components).
查找和旋转经验正交函数(<acronym> EOF</首字母缩写> S,或主要成分)。
用法----------Usage----------
eof(x, n)
参数----------Arguments----------
参数:x
a numeric object of class "matrix" or "data.frame", with no NA values
一个数字对象的类"matrix"或"data.frame",没有NA值
参数:n
number of <acronym>EOF</acronym>s to retain for rotation
数<acronym> EOF </首字母缩写> S保留旋转
Details
详细信息----------Details----------
This function is basically just a wrapper for prcomp followed by promax and is meant to facilitate routine examination of variability modes in collections of time series. For the usage intended in this package, each row of x usually will be an observation for a specific time or time period. Each column will be a specific location—the most common usage—but can also be seasons of the year (Jassby et al. 1999) or even a combination of seasons and depth layers (Jassby et al. 1990). First, eigenvalues are found by singular value decomposition of the correlation matrix. eofNum can be used to help choose n. The first n <acronym>EOF</acronym>s are then rotated using the promax method with power m = 2 (Richman 1986). Hannachi et al. (2007) give a detailed discussion of this exploratory approach with emphasis on meteorological data.
此功能基本上只是一个包装为prcomp其次是promax的,只是为了方便日常检查的变异模式在时间序列集合。打算在这个包的使用方法,每排x通常会在特定的时间或时间段的观察。每一列将是一个特定的位置,最常见的使用,但也可以是一年四季(Jassby等人,1999),或什至是季节和深度层组合(Jassby等人1990)。首先,特征值的相关矩阵的奇异值分解。 eofNum可以使用帮助选择n。第一n<acronym> EOF </首字母缩写>,,然后s的旋转使用promax方法电源m = 2(里奇曼1986)。 hannachi等。 (2007)给出了详细的讨论,这种探索性的做法,强调气象数据。
值----------Value----------
A list with the following members:
具有下列成员列表:
参数:REOF
a data frame with rotated <acronym>EOF</acronym>s
一个数据框旋转<acronym> EOF </首字母缩写> S
参数:amplitude
a data frame with amplitude time series of <acronym>REOF</acronym>s
一个数据框与的振幅时间序列的<acronym> REOF</首字母缩写> S
参数:eigen.pct
all eigenvalues of correlation matrix as percent of total variance
相关矩阵的所有特征值总方差的10%
参数:variance
variance explained by retained <acronym>EOF</acronym>s
变异的保留<acronym>EOF </首字母缩写> S
参考文献----------References----------
参见----------See Also----------
eofNum, eofPlot, monthCor, ts2df
eofNum,eofPlot,monthCor,ts2df
实例----------Examples----------
# Create an annual matrix time series[每年创建一个矩阵的时间序列]
chla1 <- aggregate(sfbayChla, 1, mean, na.rm = TRUE)
chla1 <- chla1[, 1:12] # remove stations with missing years[删除站与失踪多年的]
# eofNum (see examples) suggests n = 1[eofNum(见例子)建议N = 1]
eof(chla1, 1)
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注:
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