pls_lrCMA(CMA)
pls_lrCMA()所属R语言包:CMA
Partial Least Squares followed by logistic regression
偏最小二乘logistic回归之后的平方
译者:生物统计家园网 机器人LoveR
描述----------Description----------
This method constructs a classifier that extracts Partial Least Squares components that form the the covariates in a binary logistic regression model. The Partial Least Squares components are computed by the package plsgenomics.
这种方法构造一个分类,提取偏最小二乘形成的协变量在Logistic回归模型的组件。偏最小二乘最小二乘组件包plsgenomics计算。
For S4 method information, see pls_lrCMA-methods.
S4方法的详细信息,请参阅pls_lrCMA-methods。
用法----------Usage----------
pls_lrCMA(X, y, f, learnind, comp = 2, lambda = 1e-4, plot = FALSE,models=FALSE)
参数----------Arguments----------
参数:X
Gene expression data. Can be one of the following:
基因表达数据。可以是下列之一:
A matrix. Rows correspond to observations, columns to variables.
Amatrix。行对应的观察,列变量。
A data.frame, when f is not missing (s. below).
一个data.frame时f不缺少(S.下面)。
An object of class ExpressionSet.
对象类ExpressionSet。
参数:y
Class labels. Can be one of the following:
类的标签。可以是下列之一:
A numeric vector.
一个numeric向量。
A factor.
Afactor。
A character if X is an ExpressionSet that specifies the phenotype variable.
一个如果character X是一个ExpressionSet指定的表型变量。
missing, if X is a data.frame and a proper formula f is provided.
missing,X是data.frame和适当的公式f提供。
WARNING: The class labels will be re-coded to range from 0 to K-1, where K is the total number of different classes in the learning set.
警告:类标签将被重新编码范围从0K-1,K是在学习集不同类别的总数。
参数:f
A two-sided formula, if X is a data.frame. The left part correspond to class labels, the right to variables.
一个双面的公式,如果X是data.frame。左边部分对应类的标签,对变量的权利。
参数:learnind
An index vector specifying the observations that belong to the learning set. May be missing; in that case, the learning set consists of all observations and predictions are made on the learning set.
索引向量指定属于学习集的意见。可能missing;在这种情况下,学习组学习集的所有意见和预测。
参数:comp
Number of Partial Least Squares components to extract. Default is 2 which can be suboptimal, depending on the particular dataset. Can be optimized using tune.
偏最小二乘组件提取的数目。默认值是2,它可以是最理想的,根据特定的数据集。可以优化使用tune。
参数:lambda
Parameter controlling the amount of L2 penalization for logistic regression, usually taken to be a small value in order to stabilize estimation in the case of separable data.
logistic回归参数控制的L2处罚金额,通常是为了稳定可分离数据的情况下估计一个较小的值。
参数:plot
If comp <= 2, should the classification space of the Partial Least Squares components be plotted ? Default is FALSE.
如果comp <= 2,应绘制偏最小二乘最小二乘组件的分类空间?默认FALSE。
参数:models
a logical value indicating whether the model object shall be returned
一个逻辑值,该值指示是否应归还模型对象
值----------Value----------
An object of class cloutput.
对象类cloutput。
注意----------Note----------
Up to now, only the two-class case is supported.
到现在为止,只有两个阶级的情况下支持。
作者(S)----------Author(s)----------
Martin Slawski <a href="mailto:ms@cs.uni-sb.de">ms@cs.uni-sb.de</a>
Anne-Laure Boulesteix <a href="mailto:boulesteix@ibe.med.uni-muenchen.de">boulesteix@ibe.med.uni-muenchen.de</a>
参考文献----------References----------
<h3>See Also</h3> <code>compBoostCMA</code>, <code>dldaCMA</code>, <code>ElasticNetCMA</code>, <code>fdaCMA</code>, <code>flexdaCMA</code>, <code>gbmCMA</code>, <code>knnCMA</code>, <code>ldaCMA</code>, <code>LassoCMA</code>, <code>nnetCMA</code>, <code>pknnCMA</code>, <code>plrCMA</code>, <code>pls_ldaCMA</code>, <code>pls_rfCMA</code>, <code>pnnCMA</code>, <code>qdaCMA</code>, <code>rfCMA</code>,
举例----------Examples----------
### load Golub AML/ALL data[#负载戈卢布反洗钱/所有数据]
data(golub)
### extract class labels[#提取类标签]
golubY <- golub[,1]
### extract gene expression[#提取的基因表达]
golubX <- as.matrix(golub[,-1])
### select learningset[#选择learningset]
ratio <- 2/3
set.seed(111)
learnind <- sample(length(golubY), size=floor(ratio*length(golubY)))
### run PLS, combined with logistic regression[#运行的薪酬水平,结合logistic回归]
result <- pls_lrCMA(X=golubX, y=golubY, learnind=learnind)
### show results[#显示结果]
show(result)
ftable(result)
plot(result)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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