boxcox(MASS)
boxcox()所属R语言包:MASS
Box-Cox Transformations for Linear Models
箱Cox变换为线性模型
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Computes and optionally plots profile log-likelihoods for the parameter of the Box-Cox power transformation.
计算和可选图个人日志变电箱考克斯参数的似然性。
用法----------Usage----------
boxcox(object, ...)
## Default S3 method:[默认方法]
boxcox(object, lambda = seq(-2, 2, 1/10), plotit = TRUE,
interp, eps = 1/50, xlab = expression(lambda),
ylab = "log-Likelihood", ...)
## S3 method for class 'formula'[类formula的方法]
boxcox(object, lambda = seq(-2, 2, 1/10), plotit = TRUE,
interp, eps = 1/50, xlab = expression(lambda),
ylab = "log-Likelihood", ...)
## S3 method for class 'lm'
boxcox(object, lambda = seq(-2, 2, 1/10), plotit = TRUE,
interp, eps = 1/50, xlab = expression(lambda),
ylab = "log-Likelihood", ...)
参数----------Arguments----------
参数:object
a formula or fitted model object. Currently only lm and aov objects are handled.
一个公式或拟合模型对象。目前只有lm和aov对象进行处理。
参数:lambda
vector of values of lambda – default (-2, 2) in steps of 0.1.
向量lambda值 - 默认(-2, 2)步长为0.1。
参数:plotit
logical which controls whether the result should be plotted.
逻辑控制是否应绘制结果。
参数:interp
logical which controls whether spline interpolation is used. Default to TRUE if plotting with lambda of length less than 100.
逻辑其中控制是否使用样条插值。默认TRUE以lambda图长度小于100。
参数:eps
Tolerance for lambda = 0; defaults to 0.02.
公差lambda = 0;默认为0.02。
参数:xlab
defaults to "lambda".
"lambda"默认。
参数:ylab
defaults to "log-Likelihood".
"log-Likelihood"默认。
参数:...
additional parameters to be used in the model fitting.
要使用额外的参数模型拟合。
值----------Value----------
A list of the lambda vector and the computed profile log-likelihood vector, invisibly if the result is plotted.
lambda向量和计算剖面测井可能性向量名单,如果结果是无形绘制。
副作用----------Side Effects----------
If plotit = TRUE plots log-likelihood vs lambda and indicates a 95% confidence interval about the maximum observed value of lambda. If interp = TRUE, spline interpolation is used to give a smoother plot.
如果plotit = TRUE图数似然比lambda,并指示有关lambda最大的观测值的95%置信区间。如果interp = TRUE,样条插值是用来提供一个顺畅的图。
参考文献----------References----------
An analysis of transformations (with discussion). Journal of the Royal Statistical Society B, 26, 211–252.
Modern Applied Statistics with S. Fourth edition. Springer.
举例----------Examples----------
boxcox(Volume ~ log(Height) + log(Girth), data = trees,
lambda = seq(-0.25, 0.25, length = 10))
boxcox(Days+1 ~ Eth*Sex*Age*Lrn, data = quine,
lambda = seq(-0.05, 0.45, len = 20))
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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